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ERROR in

action number 1

of  Step Event0

for object oBattle:

Push :: Execution Error - Variable Index [0] out of range [0] - -7._possibleTargets(100102,0)

 at gml_Script_anon____struct___20____struct___19_gml_GlobalScript_GameData_5293____struct___20____struct___19_gml_GlobalScript_GameData (line 243) -                      var _target = _possibleTargets[irandom(array_length(_possibleTargets)-1)];

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gml_Script_anon____struct___20____struct___19_gml_GlobalScript_GameData_5293____struct___20____struct___19_gml_GlobalScript_GameData (line 243)

gml_Script_BattleStateSelectAction_gml_Object_oBattle_Create_0 (line 188) -                             var _enemyAction = _unit.AIscript();

gml_Object_oBattle_Step_0 (line 1) - battleState();

It's because the game undergoes an integer overflow as the code in the lecture file has not yet been added to the video series. The paid file includes the full lecture. I would recommend budgeting for it first, and upon buying it to use it as a back up file in case any modifications to your file goes wrong, for example adding a new feature. Name it something like "OriginalBackupSourceBattleSystem".  I'd rather have us learning than get frustrated waiting for lecture videos. 

bruh