Turns out a link was wrong. This error message makes no sense, it could just say "check your links because one of them is wrongly formatted".

I have used a pre-made template and I'm not sure what I should be looking for in the HTML to answer your question. I am not familiar with personalization at all.

Campaign can not be activated until all errors are resolved.Email Personalization not allowed in domain name. (CJMTL - 010018-422) I went through the documentation and can't find how to resolve this. Any tips?