Laravel could not be opened: failed to open stream: Permission denied

When you first setup a laravel project, you might encounter this error 'could not be opened: failed to open stream: Permission denied' or 'PHP Fatal error: Uncaught UnexpectedValueException: The stream or file'.

How to change Whoops, looks like something went wrong error message in Laravel 4.2

'Whoops, looks like something went wrong', is the dafault error message from laravel, if you turn off the debugging option in laravel. You will not get this message when error happens and the debugging mode on laravel is set enable.

How to enable and disable Debug mode on Laravel 4.2

One of the cool feature on laravel is that it has debug mode, when you are on development stage, it is always a good idea to enable debugging mode on laravel, later on production stage you can disable the debug mode.

Error in exception handler Laravel 4.2

'Error in exception handler.' is the common error message that you get when setting up laravel project for the first time. The question is how to solve this issue? how to fix it?