I'm here because I just found the issue as well. Seeing the same error window.
I'm not sure if Pinellos' is the same problem, as in my tests (mostly exporting to arcade), if it won't work, it won't no matter the folders, or graphics.
I also tried Signupdemos's suggestion of the browser plugin, and adding the object to a working capx causes the error, and removing it lets it work again. By TELLES0808's comment, it's probably more than one object triggering it.
however, I've tried adding all the other objects, and it's the only one that triggered the error in a working capx.
Removing the browser object from Space Blaster lets it minify.