Symptoms

When trying to run any forms you receive the error:
Exception of type 'System.Web.HttpUnhandledException' was thrown
 

Diagnoses

Looking at the SourceCode.Form.Runtime.Error log located at tINSTALLDIR]:Program Files (x86)K2 blackpearlHost Serverin you see that the error being logged is "An item of the same key has already been added", and the stack trace references getting a theme.

 

Resolution

- Check the K2.Form.Theme table for duplicate entries.

- Copy the table to preserve the information, and delete one of the entries (the one that looks most recently added