hi if you were getting those errors on a regular basis, here are the steps to hopefully fix the issue for you too:

1) go to assign
2) manage drug policies
3) make a new policy (this should also refresh the full list of available drugs for you, in case you added some more mods to an existing savegame)
4) call it something unique, like NoDrugsNow
5) edit the settings so that everything has a red cross, without anything ticked.
6) close this new policy
7) now select any droid or battledroid (from chjees androids) and assign them the newly-created NoDrugsNow policy you made above. (by clicking on the button under drug policy column and selecting it)

+ try to make sure all other colonists are using a newly-created policy with the settings you wish, as i think this error tends to happen when new items are added by mods etc (but to an existing game)

= this should now fix the issues for you (fingers crossed) :o)