There is a compatibility range mismatch between the Web server and database "|0", and connections to the data have been blocked ...

There is a compatibility range mismatch between the Web server and database "|0", and connections to the data have been blocked to due to this incompatibility. This can happen when a content database has not been upgraded to be within the compatibility range of the Web server, or if the database has been upgraded to a higher level than the web server. The Web server and the database must be upgraded to the same version and build level to return to compatibility range.