Class [myClass] is not autoloadable, can not call post-update-cmd script

I got this error while installing my composer package of my drupal 8 installation. 

Possible solutions

Remove the 'Vendor' map and run 'composer update'

or:

Check the namespace, perhaps forgot a capital letter?

 

 

Saved you some valuable time?

Buy me a drink 🍺 to keep me motivated to create free content like this!