Invalid route action when $namespace = 'App\Http\Controllers'

[bomshteyn]

Error while trying to install it.

Invalid route action: [App\Http\Controllers\Spatie\SupportBubble\Http\Controllers\HandleSupportBubbleSubmissionController].

I assume it has something todo with the defined namespace, but short of removing it and redoing all the other routes in the api file, is there another way to fix this?

my namespace is set to:
$namespace = 'App\Http\Controllers'