EPiServer 5.2.375.226 can only be used with database version 5204, current version is 5202. Make sure both database and assemblies are upgraded correctly.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: EPiServer.Core.EPiServerException: EPiServer 5.2.375.226 can only be used with database version 5204, current version is 5202. Make sure both database and assemblies are upgraded correctly.

Source Error