Excel class 'excel' not found

Describes the cause and action for error messages.

Error Message(English)：
class 'excel' not found

Resolution

Followed instructions but still Class 'Excel' not found ・ Issue #510 ...
https://github.com/Maatwebsite/Laravel-Excel/issues/510

(1/1) FatalErrorException Class 'Excel' not found in MastersController ...
https://laracasts.com/discuss/channels/laravel/11-fatalerrorexception-class-excel-not-found-in-maste・・・

Installing maatwebsite/excel with laravel 5.2 - Stack Overflow
https://stackoverflow.com/questions/36257130/installing-maatwebsite-excel-with-laravel-5-2?rq=1