Did you try

php artisan dump-autoload

?

From the Laravel documentation:

This command will regenerate the autoload files for your root project, as well as any workbenches you have created.

To @d33k4y : Yes ~ I have already try it, but I still get the ERROR " Class 'LaravelFacebookRedirectLoginHelper' not found "

can you try this and run "php artisan dump-autoload" again ?

"autoload": {
	"classmap": [
		"app/commands",
		"app/controllers",
		"app/models",
       "app/libs",
		"app/database/migrations",
		"app/database/seeds",
		"app/tests/TestCase.php"
	]
    },

to @tantam I have set this befor > < still cant use this class

this my composer.json

"autoload": {
         "classmap": [
             "app/commands",
             "app/controllers",
             "app/models",
             "app/libs",
             "app/database/migrations",
             "app/database/seeds",
             "app/tests/TestCase.php"
         ]
     }

Sometime I got this issue and I have to remove complied and vendor folder, then I run composer install again ! Maybe you can try ?

Or, maybe you have to add \ before your class name ?