7538c605_Data_Mining___SQLServerCentral__Cause_Solution
[Error] 6. Unprocessed Dimension Errors – You receive one of the following errors, possibly in combination with the others, when attempting to process a cube: 1. “Object does not contain any cases. The drillthrough store is empty either because the ProcessType enumeration was set to ProcessClearStructureOnly, or a DMX DELETE statement cleared the store.” 2. “Mining model failed because either the training data is empty or there were no significant attributes found” 3. You receive VALUE! errors on calculated measures 4. Error messages warning you that SSAS could not find an attribute [Cause/Solution] 
I received this cluster of errors on a couple of occasions after adding new data to the dimensions, because I did not process them before processing the cube. SSAS couldn’t retrieve the data so it could not process the associated mining models and in turn, could not process the mining model dimensions associated with them. Processing the dimensions followed by the cube fixed all of these errors.
An Informal Compendium of SSAS Errors, Part 2: Data Mining - SQLServerCentral
Cause/Solution