Unable to load template snippet 'widgets/error/generic_error.tpl'

Shopware 5 International (English Only)
4

I also get this error for marketing–shopping-worlds (Einkaufswelten). You can get the real error if you turn on exceptions in config:

'phpsettings' => [
	'display_errors' => 1,
],
'front' => [
	'showException' => true,
	'throwExceptions' => true,
	'noErrorHandler' => false,
],
'template' => [
	'forceCompile' => true,
],
'model' => [
	'cacheProvider' => 'array'
],
'httpCache' => [
	'enabled' => false, // true or false
	'debug' => true,
],

In my case it was: modifier ‚mb_substr‘ not allowed by security setting