7538c605_Data_Mining___SQLServerCentral__Cause_Solution
[Error] 3. Predict Function OLAP Error – When using the MDX Predict function, you receive the following unfathomable error: “The specified mining model is not part of an OLAP mining structure” [Cause/Solution] 
This is one of those arcane messages which return no results on search engines. It seems to occur when a DSV is set to a SQL Server source rather than a cube, so the only solution may be the messy one of changing the DSV itself.
An Informal Compendium of SSAS Errors, Part 2: Data Mining - SQLServerCentral
Cause/Solution