I figured it out.
After installing that Mod, I had to change the Store CSS Stylesheets as Files? to Yes.
I disabled the CSS compression within the Mod once again. The error should now be gone.
But I had to set it back to No. Styles & Language Settings ==>Store CSS Stylesheets as Files? = No.
You are right. Since my Forum is new, I probably do not need it.
I can not seem to figure out which template to edit in order to change the Google Ad color scheme. But I have only been looking for 10 minutes.
There are some more of your Styles that I like which I will install later on. :up: