Can’t install addon from zip

I’m creating an addon, and when I try to install it from zip, it fails. But I can’t get why it fails. In the log the only reference is this:

Code:
20:50:13 T:140337359313024   DEBUG: CAddonInstaller: installing from zip '/home/davo/Documents/simkl-kodi/script.service.simkl.zip'

How can I know what is failing?