laravel 5 - Your configuration files are not serializable

Question

I ran

php artisan config:cache

on my terminal and i got a LogicException

LogicException  : Your configuration files are not serializable.

at C:xampphtdocs{PROJECT}vendorlaravelframeworksrcIlluminateFoundationConsoleConfigCacheCommand.php:68

 64|             require $configPath;
 65|         } catch (Throwable $e) {
 66|             $this->files->delete($configPath);
 67|
 68|             throw new LogicException('Your configuration files are not serializable.', 0, $e);
 69|         }
 70|
 71|         $this->info('Configuration cached successfully!');
 72|     }

 Exception trace:

1   Error::("Call to undefined method Closure::__set_state()")
  C:xampphtdocs{PROJECT}ootstrapcacheconfig.php:241

2   require()
  C:xampphtdocs{PROJECT}vendorlaravelframeworksrcIlluminateFoundationConsoleConfigCacheCommand.php:64

Please use the argument -v to see more details.

I've never encountered this error before when running this command. Please any help will be appreciated. Thank you.

Answer 1

To find out where exactly the issue is, you can temporarily remove $this->files->delete($configPath); from vendor/laravel/framework/src/Illuminate/Foundation/Console/ConfigCacheCommand.php. By doing so bootstrap/cache/config.php does not get automatically deleted and you can look up the mentioned line (here 241) in the config.php file.