Symptoms

Filtering the picker control results to the following error: ? Column ' EncodedColumnName]' does not exist.

It may have been deleted by another user.?

The same error pops up when executing the SharePoint Online SmartObject from the tester with filtering and paging enabled.
 

Diagnoses

This error is thrown when filtering is done on a non-ASCII column.
 

Resolution

A coldfix resolved this issue. Please contact K2 Support to request for this.