I got an error when I interact with the slimes:
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ERROR in
action number 1
of Create Event
for object oBattle:
argument 5 needs to be a struct
at gml_Object_oBattle_Create_0 (line 37) - enemyUnits[i] = instance_create_depth(x+250+((i mod 3)*10)+((i div 3)*25),y+68+((i mod 3)*20),unitDepth,oBattleUnitEnemy,enemies[i]);
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gml_Object_oBattle_Create_0 (line 37)
gml_Script_NewEncounter (line 3)
gml_Object_oSlime_Collision_oPlayer (line 3) - NewEncounter(choose([oBattleUnitSlime,oBattleUnitSlime],[oBattleUnitSlime]), sBgField);