Laravel 5 on php artisan config:clear generated Closure::__set_state() error

I had similar issues when I ran php artisan config:cache. Apparently, it is an issue when the application is trying to load cached configuration files that have closures in it. It won't be fixed in Laravel since it is a bad practice to have closures in config files. Refer this Github issue

The way I solved this is by undo-ing this.

Delete the cache for config.

It is located in here

bootstrap/cache/config.php

OR

vendor/config.php

I had faced the similar issue in past don't know what caused it but as of now you can delete the config.php from /vendor it won't break your code.

And your code will be start working..

Among other root-causes, this error results from calling php artisan config:cache when a closure is defined inside any configuration file that Laravel attempts to load. Laravel does not allow for closures in configuration files; see:

https://github.com/laravel/framework/issues/9625

Deleting the resultant cache file, usually located at bootstrap/cache/config.php, "fixes" the error.

The long-term solution is to eliminate closures from all configuration files. The problematic config file can be determined by inspecting the offending line, as mentioned in the error message.

If the offending file is third-party, it is best to open an issue with the library, so that the issue is fixed upstream.