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Windows Audio Issues in Gamemaker File

One of my students is getting this error:

audio_is_playing argument 1 incorrect type (undefined) expecting a Number (YYGI32)
at gml_Object_Obj_game_Other_4 (line 16) - if (!audio_is_playing(l6C011BEE_0))

I have a completed Teacher file that I have and he has the same exact DND coding as I do, I have looked and looked.

Does anyone have an idea of where and why this is happening. My Teacher file runs fine.


What is l6C011BEE_0 referring to? Usually you check for the name of the audio asset, or an instance of audio.