I was able to replicate this UserFrosting by removing write permission to the log file, which resulted in a similar error message :

Fatal error: Uncaught Error: Invalid callback Monolog\Handler\StreamHandler::customErrorHandler, cannot access private method Monolog\Handler\StreamHandler::customErrorHandler()

Using the example above (https://3v4l.org/ZHA87) on the same environment and on the same file (without write access) returned the proper output :

string(40) "Failed to open stream: Permission denied" string(9) "Test test"

The difference is our app use a custom StreamWrapper. So the core PHP fopen isn't actually called by Monolog's StreamHandler, but our own. And both will invoke customErrorHandler, which won't work on our side since the method is private. Therefore, customErrorHandler must be public.

Note the actual process when customErrorHandler is public is similar to this :

Monolog StreamHandler call fopen
Our own StreamHandler calls fopen
fopen trows an exception
Our StreamHandler invoke customErrorHandler (even if we use @fopen), then do the rest of it's job and return false.
Monolog invoke customErrorHandler again

cannot access private method #1866

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