Magento 2 development could raise a lot of questions. And if you see blank screen you and don’t know how to diagnose error this article is definitely for you. Basically there are 3 variants of errors:
There has been an error processing your request
There has been an error processing your request Exception printing is disabled by default for security reasons. Error log record number: XXXXXXXXXXXX
It means that Magento 2 runs in default or production mode. You wont see the actual error message on the screen, only error report ID. Errors are logged to the file system and are never displayed to the user. Detailed error report could be found in the var/reports folder.
Magento 2 interface does not respond to any actions
More about Chrome developer console
You see blank screen
– enable display_errors from app/bootstrap.php file line 11 – remove # from starting.
– check that error_reporting from app/bootstrap.php file line 10 set to E_ALL
– switch magento 2 to developer mode
– check error logs in var/log folder ( var/log/exception.log )