Thanks for the report!
I'm aware of this bug, currently trying to understand why this happens. Possibly, you changed the selected character while moving and the game lost it target to calculate a few things. Is this your case as well?
Glad to hear you're having fun! I'm working on 1.2 but had to do a brief pause this week for college projects, but soon it'll be available :)
Viewing post in PATCH 1.1.2 -Display Resolution & Camera Hotkeys comments
Hi there!
The error appears under not-so-clear circumstances. I tried to replicate it after I noticed it happen when first selecting the character to move and then another area that wasn't green. Also, I had this error while selecting with right-click an enemy before selecting a character to attack with:
action number 1
of Step Event0
for object obj_control:
Pop :: Execution Error - Variable set failed HP - read only variable?
at gml_Script_scr_action_attack
gml_Script_scr_action_attack (line -1)
gml_Script_scr_player_turn
gml_Object_obj_control_Step_0
Hope it can help a little more with the debugging. I can relate to the pain of having errors that are hard to replicate.
Good luck!