Snappdf error, hosted works

Installed snappdf using info at: Free Source Available Invoicing, Expenses & Time-Tracking | Invoice Ninja

When generating a pdf i get the following error:
500: Internal Server Error • Call to undefined function Symfony\Component\Process\proc_close()

The php function is not disabled.

hosted_ninja works


I’m not sure, the usual cause for this error is proc_close being disabled.

I found this issue, maybe it will help.

Appears to be GLIBC issue.