So I see this thread ran cold but I’m experiencing the same issue. Did anybody find a solution?
EDIT: I just noticed the error is actually different to OPs, apologies. New thread here.
Login error: Deserializing ‘[data, [{permissions: , notifications: {email: [all_notifications]}, settings…’ to ‘minified:qT’ failed due to: Deserializing ‘[banks, [{id: 232, name: 121 Financial Credit Union, remote_id: 666, bank_lib…’ to ‘minified:xi’ failed due to: Deserializing ‘[{id: 1, created_at: 1541743430, updated_at: 1541743430, name: Authorize.Net …’ to ‘minified:Aminified:iu’ failed due to: Deserializing ‘[id, 1, created_at, 1541743430, updated_at, 1541743430, name, Authorize.Net A…’ to ‘minified:iu’ failed due to: Tried to construct class “GatewayEntity” with null field “fields”. This is forbidden; to allow it, mark “fields” with @nullable.