This error usually occurs when you're attempting to carryforward a type of return that does not have current year support. This is most common earlier in the season when most of the form updates haven't been released or updated yet.
You may click OK to continue through the error and finish the carryforward process. If you receive this error, please check your updates by going to Communications at the top of the screen, then select Get Module Updates.
For more information on updating your modules, please see this article, explaining module updates.