I get this error:
Server error: POST https://invoice.domain.de/api/v1/migration/start resulted in a 500 Internal Server Error response: 500 Internal Server Error < (truncated…)
LOG File v5 said:
[2021-12-25 14:33:22] production.INFO: Importing account
[2021-12-25 14:33:22] production.INFO: Importing company
[2021-12-25 14:33:23] production.INFO: Importing users
[2021-12-25 14:33:23] production.INFO: Importing payment_terms
[2021-12-25 14:33:23] production.INFO: Importing tax_rates
[2021-12-25 14:33:23] production.INFO: Importing clients
[2021-12-25 14:34:11] production.INFO: Importing company_gateways
[2021-12-25 14:34:12] production.INFO: Importing client_gateway_tokens
[2021-12-25 14:34:12] production.INFO: Importing vendors
[2021-12-25 14:34:12] production.INFO: Importing projects
[2021-12-25 14:34:12] production.INFO: Importing products
[2021-12-25 14:34:12] production.INFO: Importing credits
[2021-12-25 14:34:12] production.INFO: Importing recurring_invoices
[2021-12-25 14:34:12] production.INFO: Importing invoices
v4 Log End:
[2021-12-25T14:33:01.383725+00:00] production.INFO: get account [] []
[2021-12-25T14:33:01.397413+00:00] production.INFO: get company [] []
[2021-12-25T14:33:01.398032+00:00] production.INFO: get co settings [] []
[2021-12-25T14:33:01.413674+00:00] production.INFO: get users 3 [] []
[2021-12-25T14:33:01.420449+00:00] production.INFO: get tax rates => 2 [] []
[2021-12-25T14:33:01.425400+00:00] production.INFO: get payment terms => 9 [] []
[2021-12-25T14:33:01.431139+00:00] production.INFO: get clients => 150 [] []
[2021-12-25T14:33:01.440928+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.445186+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.448618+00:00] production.INFO: Importing contacts => 4 [] []
[2021-12-25T14:33:01.454390+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.457607+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.463049+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.465844+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.468708+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.471629+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.474612+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.477703+00:00] production.INFO: Importing contacts => 5 [] []
[2021-12-25T14:33:01.484211+00:00] production.INFO: Importing contacts => 5 [] []
[2021-12-25T14:33:01.488186+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.492150+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.495466+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.498527+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.505169+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.511985+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.515840+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.519129+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.522265+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.525243+00:00] production.INFO: Importing contacts => 4 [] []
[2021-12-25T14:33:01.529253+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.532242+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.535205+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.537995+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.541017+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.544064+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.547096+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.552338+00:00] production.INFO: Importing contacts => 4 [] []
[2021-12-25T14:33:01.555919+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.558977+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.561819+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.571990+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.578390+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.584032+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.589671+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.595020+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.600741+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.606503+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.612340+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.617686+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.623061+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.629078+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.634672+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.640515+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.646266+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.651869+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.657856+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.663585+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.669917+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.676326+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.682741+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.689000+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.697043+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.704073+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.710997+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.717905+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.724459+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.732132+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.738992+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.745536+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.752550+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.758625+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.764580+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.770623+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.776337+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.781976+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.788249+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.794135+00:00] production.INFO: Importing contacts => 4 [] []
[2021-12-25T14:33:01.799991+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.805211+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.810586+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.816135+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.821553+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.826913+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.832122+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.837137+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.842686+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.847965+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.854870+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.860298+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.865504+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.870642+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.875841+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.880994+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.886226+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.891307+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.896482+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.901390+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.906638+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.912029+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.917630+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:01.924191+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.930368+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.938198+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.943216+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.948576+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.954161+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.959412+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.964397+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.969395+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.974661+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.979926+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.985415+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:01.990597+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:01.996070+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:02.001382+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.007001+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.011909+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.017549+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.023394+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.030759+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:02.037175+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.043489+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.049427+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:02.055881+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.062652+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:02.069165+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:02.078702+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:02.084792+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.091916+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.098431+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.104943+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:02.111573+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.118845+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:02.125349+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.130980+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.136520+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.142481+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.148001+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:02.154628+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:02.161433+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:02.167431+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.173732+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.181017+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.190192+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.197482+00:00] production.INFO: Importing contacts => 3 [] []
[2021-12-25T14:33:02.205378+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:02.216565+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:02.223279+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.229586+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.236595+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.243820+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.249213+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:02.254570+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.259767+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.266064+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.271399+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.276607+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.284184+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.289897+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.296304+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.302987+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.309482+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:02.316148+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.322592+00:00] production.INFO: Importing contacts => 2 [] []
[2021-12-25T14:33:02.332367+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.348283+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.355061+00:00] production.INFO: Importing contacts => 1 [] []
[2021-12-25T14:33:02.364163+00:00] production.INFO: get get company gateways => 8 [] []
[2021-12-25T14:33:02.364250+00:00] production.INFO: translating gateway ID = 17 [] []
[2021-12-25T14:33:02.372683+00:00] production.INFO: translating gateway ID = 17 [] []
[2021-12-25T14:33:02.373040+00:00] production.INFO: get transform fees and limits [] []
[2021-12-25T14:33:02.377884+00:00] production.INFO: translating gateway ID = 17 [] []
[2021-12-25T14:33:02.380509+00:00] production.INFO: translating gateway ID = 17 [] []
[2021-12-25T14:33:02.380750+00:00] production.INFO: get transform fees and limits [] []
[2021-12-25T14:33:02.383596+00:00] production.INFO: translating gateway ID = 23 [] []
[2021-12-25T14:33:02.388962+00:00] production.INFO: translating gateway ID = 23 [] []
[2021-12-25T14:33:02.389214+00:00] production.INFO: get transform fees and limits [] []
[2021-12-25T14:33:02.392869+00:00] production.INFO: translating gateway ID = 64 [] []
[2021-12-25T14:33:02.396295+00:00] production.INFO: translating gateway ID = 64 [] []
[2021-12-25T14:33:02.396561+00:00] production.INFO: get transform fees and limits [] []
[2021-12-25T14:33:02.399265+00:00] production.INFO: translating gateway ID = 23 [] []
[2021-12-25T14:33:02.404057+00:00] production.INFO: translating gateway ID = 23 [] []
[2021-12-25T14:33:02.404312+00:00] production.INFO: get transform fees and limits [] []
[2021-12-25T14:33:02.407319+00:00] production.INFO: translating gateway ID = 23 [] []
[2021-12-25T14:33:02.410422+00:00] production.INFO: translating gateway ID = 23 [] []
[2021-12-25T14:33:02.410664+00:00] production.INFO: get transform fees and limits [] []
[2021-12-25T14:33:02.413312+00:00] production.INFO: translating gateway ID = 9 [] []
[2021-12-25T14:33:02.416656+00:00] production.INFO: translating gateway ID = 9 [] []
[2021-12-25T14:33:02.416917+00:00] production.INFO: get transform fees and limits [] []
[2021-12-25T14:33:02.419557+00:00] production.INFO: translating gateway ID = 64 [] []
[2021-12-25T14:33:02.422178+00:00] production.INFO: translating gateway ID = 64 [] []
[2021-12-25T14:33:02.422388+00:00] production.INFO: get transform fees and limits [] []
[2021-12-25T14:33:02.429484+00:00] production.INFO: get client gateway tokens => 2 [] []
[2021-12-25T14:33:02.438726+00:00] production.INFO: get converting payment method meta [] []
[2021-12-25T14:33:02.445458+00:00] production.INFO: get converting payment method meta [] []
[2021-12-25T14:33:02.449430+00:00] production.INFO: get vendors => 0 [] []
[2021-12-25T14:33:02.453279+00:00] production.INFO: get projects => [] [] []
[2021-12-25T14:33:02.457975+00:00] production.INFO: get products 27 [] []
[2021-12-25T14:33:02.478454+00:00] production.INFO: get credit notes => 0 [] []
[2021-12-25T14:33:02.524719+00:00] production.INFO: get invoices → 1749 [] []
[2021-12-25T14:33:12.832375+00:00] production.INFO: get recurring Expenses => 0 [] []
[2021-12-25T14:33:12.839010+00:00] production.INFO: get recurring invoices => 1 [] []
[2021-12-25T14:33:12.884135+00:00] production.INFO: get quotes => 3 [] []
[2021-12-25T14:33:12.938927+00:00] production.INFO: get payments => 1751 [] []
[2021-12-25T14:33:19.758501+00:00] production.INFO: get credits => 0 [] []
[2021-12-25T14:33:19.764670+00:00] production.INFO: get documents => 64 [] []
[2021-12-25T14:33:19.776084+00:00] production.INFO: get expense categories => 0 [] []
[2021-12-25T14:33:19.780290+00:00] production.INFO: get task statuses => 4 [] []
[2021-12-25T14:33:19.785110+00:00] production.INFO: get expenses => 0 [] []
[2021-12-25T14:33:19.789103+00:00] production.INFO: get tasks => 0 [] []
[2021-12-25T14:33:19.800652+00:00] production.INFO: get documents => 64 [] []
[2021-12-25T14:35:06.494027+00:00] production.INFO: Server error: POST https://invoice.domain.de/api/v1/migration/start resulted in a 500 Internal Server Error response: 500 Internal Server Error < (truncated…) [] []
PHP 7.4 is running 
What should i do?
Thx a lot.
Stefan