Symptoms

After upgrading to Blackpearl 4.7 the following error  message is displayed when trying to deploy K2 package:

'Unsupported schema version 15 - version 14 or earlier is supported. Please update to the latest version. Parameter name: xml'
 

Error message screenshot:

Diagnoses

The issue can happen when the K2 package was originally created in a 4.7 environment with additional fixes (i.e. Cumulative Updates and Fix Packs). In this case K2 Package and Deployment tool will see a mismatch in assemblies when deploying to a 4.7 environment without those fixes. 

To verify whether additional fixes such as cumulative Feb update or fix packs (i.e. FP1 or FP2) have been applied to a K2 environment in 4.7, you can check the history of applied fixes in HostServer.UpdateHistory table (table added starting from blackpearl version 4.7). When a fix is applied in the environment, the UpdateHistory table will be created.
 

Resolution

Apply the same fix(es) to both environments to resolve this issue.