Symptoms

While upgrading from K2 blackpearl 4.5 to blackpearl 4.6.8, the error "databases of wrong type exist" is shown on the database configuration page.
 

Diagnoses

The compatibility level of the databases was set to 90, which is the equivalent of SQL 2005 - an unsupported version of SQL in blackpearl 4.6.8.
 

Resolution

- Close setup.exe
- Back up the databases
- Change the database compatibility level to at least 100 (SQL 2008/R2)
- Re-run Setup.exe