I was getting the this error while trying to map Managed Property to Crawled Property, in this case
RefinableDate00 to ows_ArticleStartDate.
I was not sure why this error was coming. Searched for the answer but couldn’t find one. So tried the same thing after some time. And surprisingly it worked and it didn’t give the error.
So anybody facing this issue, should better relax and wait for application to come out of the paused state.
BTW, if anybody knows what does the error exactly mean share your knowledge please.