Android DoSub:2: undefined value


Screenshot_20210611-062520_Isometric 2048 Engine.jpgScreenshot_20210611-062531_Isometric 2048 Engine.jpg
Hi everyone,
I bought a project from the marketplace to see system mechanics used in the project.
I test it on my desktop, everything worked perfectly. However, when I tested it on my mobile it gave me this error : DoSub:2: undefined value. It's the first time that I saw this kind of error.

Also, why the game maker banner did not disapear?
Room size: 1024x1024 view_size: 1024x1024

Could anyone help me?
Thank you!