CRM 2013: SLA error

I have installed SP1 for CRM 2013 and am trying to use the new SLA functionality.

I created an SLA with two SLA items - one for first response, the other for resolution.

I activated the SLA and set it as the default.

I then tried to create a case to test the SLA but got this error:

                Starting sync workflow 'SLA3', Id: 5e6ab279-66fc-e311-80c6-b603f1daadf6

                Entering ConditionStep1_step: SLA3

                Entering ConditionStep5_step: Check condition step - Applicable When- KPI1

                Sync workflow 'SLA3' terminated with error TimeTrackingCacheLoader Operation encountered some errors 

Does anyone know what this means, or how to resolve the problem?