The error is due to the database version and Sitefinity version not being equal.
This occurs due to an upgrade process that has been initiated in a second environment while using the database from the first environment. As a result, this will cause the version stored in the database to be different from the version on the site from the first environment.
<add connectionString="data source=.\SQL2014;Integrated Security=SSPI;initial catalog=Database"
name="Sitefinity" IgnoreDowngradeExceptions="true" />