Laravel处理异常

I'm just jump into laravel, this is my first project with.

Now i'm trying to add new exception to handler stack, but for sorry it's not working and i don't know why.

here is my exception class

namespace Lib\Modules\Users\Exceptions;

use Lib\Abstracts\AbstractException;

class ConnotCreateUserException extends AbstractException {

}

Here is my abstract

namespace Lib\Abstracts;

class AbstractException extends \Exception {

}

and here is my error registration inside app/start/global.php

App::error(function(Exception $exception, $code)
{
    Log::error($exception);
});

App::error(function(Lib\Modules\Users\Exceptions\ConnotCreateUserException $exception){
   return 'Sorry! Something is wrong with this account!';
});

when i throw the exception, i got blank page. but i'm sure it's handled as type of "\Exception" exception.

Thanks in advance

As the code looked fine, I just did some tests with it and it works for me, just make sure your namespaces are being loaded correctly by doing:

composer dump-autoload

But, anyway, here's what I did:

1) Created a PSR-4 autoloading for it:

"autoload": {
    "classmap": [
        ...
    ],
    "psr-4": {
        "Lib\\" : "app/App/Lib"
    }
},

2) Create the files using your very content:

app/App/Lib/Abstracts/AbstractException.php
app/App/Lib/Modules/Users/Exceptions/ConnotCreateUserException.php

3) executed

composer dump-autoload

4) opened vendor/composer/autoload_psr4.php just to make sure it was there:

return array(
    'Lib\\' => array($baseDir . '/app/App/Lib'),
);

5) Added this all in my routes.php file:

App::error(function(Exception $exception, $code)
{
    Log::error($exception);
});

App::error(function(Lib\Modules\Users\Exceptions\ConnotCreateUserException $exception){
   return 'Sorry! Something is wrong with this account!';
});

Route::get('/', function()
{
    throw new Lib\Modules\Users\Exceptions\ConnotCreateUserException("We should not get this message!", 1);
});

6) Hit:

http://server.dev/

And got the message

Sorry! Something is wrong with this account!