Can't harvest models in web portal from mart server Persistence Units Component ! Failed to access a directory or a model (4372068)

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Can't harvest models in web portal from mart server Persistence Units Component ! Failed to access a directory or a model
Description

For some models while harvesting in Web Portal they get the errors,
Running mart script as user SYSTEM in domain
Could not retrieve model mart://Mart/Enterprise. Persistence Units Component ! Failed to access a directory or a model with Mart/EDH - Enterprise Usage path.
Cause

The version of erwin DM installed on the web portal host machine is an older version than that being used by the data modelers. We were able to see that by trying to open the same models on the web portal host machine using erwin and got the error "The mart model could not be upgraded to the current metamodel level".
Resolution

Upgraded the copy of erwin DM on the Web Portal host machine to the same version of erwin the data modelers were using and the customer was then able to successfully harvest their models again.

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