In order for SharePoint Workflow Integration processes to function properly, a Workflow History and Tasks list must be created in the SharePoint Site Collection where you will use this K2 feature.

The simplest way to configure this is to enable a SharePoint out-of-the-box workflow, which will create a Workflow History and Tasks list for you. For more information, see the following article: http://office.microsoft.com/en-us/sharepointserver/HA101720071033.aspx#3