The answer to your question is contained within the error message.
The right thing to do in this case would be to smack whoever wrote that line, and make a list of each option specified. If it appears with a minus at all, put it in once with a minus. If it appears only bare or with a plus, put it in once with a plus.
I believe you just want this:
Options +SymLinksIfOwnerMatch +ExecCGI +Includes +IncludesNOEXEC -Indexes
Why this particular option set is required in that area, I don't know. But, feel free to read the documentation for an explanation of each one, and see how or if your use case requires it.