SOLVED "Workspace includes elements that don't compile."

I'm using MCreator 2021.1 (Windows 64 bit) to make a Forge 1.16 mod. There are two things in the mod: the mob that I am making and the procedure for when it dies. The mob seems to be marked with a red arrow (which I'm assuming is an error). The procedure is not.

This is the console log when I try to run client. 
And this is the zip file.

Edit: It has been solved. I went to Blockbench, changed the file name and model name in the Project tab, and exported it as a new file. Then I deleted all other files in MCreator and put in the newest. It worked afterwards.