There is an error of unknown origin that may destroy the model info needed for Evolve of the Admin DB of MDrivenServer.
The error shows up as:
Problem in portalpush Unknown valuetype in admin_ECO_ORMAPPING table ()
The root cause is yet unknown. The admin_ECO_ORMAPPING has been wrongfully cleared of model info.
To fix - find another MDrivenServer with the same current admin model and go to <mdrivenServer>/admin/EvolveDebugPage.aspx
Execute the "Get from Current"
Copy the resulting XML text from the Admin DB Script box.
Paste this value into the MDrivenServer with the error - Submit - then "Update Current With Given."
(This operation inserts the missing DB Script. There are other ways to do this. Download DB, use a SqlCompact tool like LinqPad, and insert the missing script. Upload model)