"No query results for model [App\Models\Pirep] prefile" simply means that Acars is not able to connect to your phpvms properly and can not pre-file the pirep to move on...
And root cause of that error lies just above it ;
08-27 00:16:00|ERROR; uri=http://
08-27 00:16:00|ERROR; req=https://
Sometimes, SSL certificates do these kind of redirections and when that happens, acars fails 'cause it looks for http response comes from https (or vice versa).
Check your acars settings and your phpvms / env.php (APP_URL=)
Hope this helps