7538c605_Data_Mining___SQLServerCentral__Cause_Solution
[Error] 7. Missing Source OLAP Object with Data Mining – When working with data mining, you receive an error indicating that a “source OLAP object” for a column “cannot be found.” [Cause/Solution] 
This error went away after I changed the column type of a calculated measure from Cyclical back to Continuous, which is what the Wizard had originally assigned.
An Informal Compendium of SSAS Errors, Part 2: Data Mining - SQLServerCentral
Cause/Solution