Steps to reproduce the issue

I did a:

git pull origin 4.0-dev

I didn't get any error while pulling but when I tried to reload /administrator, I get this:

Error: Class 'Joomla\Module\Version\Administrator\Helper\VersionHelper' not found: Class 'Joomla\Module\Quickicon\Administrator\Helper\QuickIconHelper' not found

Additional comments

I don't know what changed in the code but understandably it is still in Alpha. I was able to fix it by deleting all the files and copying over a downloaded zip file of the same branch (But using my previous database).

Another issue with the current version of 4.0-dev branch is suddenly the Extension class is no longer auto loaded when called in the administrator\components\com_custom\services\provider.php file. My custom component would not run anymore. I am getting an error class not found:

Class 'Joomla\Component\Mycomponent\Administrator\Extension\MyComponent' not found

I did not change anything with the provider.php file and it use to work before the git pull. Seems like the class MyComponent is not being auto loaded anymore.

I guess it is wrong to develop while the framework is still in Alpha LOL!