[TYPO3-dev] Error 'The requested resource "/login" was not found'

[Stefan Franke]

> I've kind of destroyed my TYPO3 8.7.9 instance, but I don't remember how 
> (I was playing around with Composer, though this is not a Composer-installation 
> of TYPO3). Frontend is working fine, when trying to access the backend, I'm 
> confronted with the folloing TYPO3 Exception:

Ok, I've managed to solve it – somehow my PackageStates.php was changed and the lines concerning the backend module went missing:

---------------------
'backend' => [
    'packagePath' => 'typo3/sysext/backend/',
],
---------------------

Regards,
Stefan