Hm, that is strange indeed. The only thing I can think of is if you have an old WHDLoad install. I sent you a DM on discord, if you want some help figuring it out.
Viewing post in Roguecraft DX Amiga - OUT NOW! comments
Hi, I am getting the same error using beta WHDLoad here https://whdload.de/whdload/whd200.lha
Using a PiStorm A500+