Installing Gapps (space problem) I have installed the custom ROM from TeamWin recovery mode for android 8.1 (don't judge ). Everything was installing fine with no errors but then I then installed Gapps, it then told me there is not enough free space on /system partition. How can I free up some space to install Gapps?

EDIT:

Check this log file!
I guess you have two way. 


Go to Custom Recovery and wipe /System partition Then, reinstall Custom ROM. (Maybe /System partition have problem and after doing this step that's fixed. )   
Download Nano Variant of gapps and install on your device. It's very light. Go to Play Store and install other Google Application. (If you install Google Application from Google Play, they installed on /Data partition and /System partition be free.)