GDM-100 "Attempting to reference a deleted object" error when opening any Mart model from erwin Data Modeler

Description:

Connection to Mart from Data Modeler is successful, but when opening any Mart model, the below error is thrown and when you click OK, erwin crashes. ALL models in Mart are effected. 

Error:

"An unexpected condition has occurred. Please contact erwin Technical Support and report this situation.

Attempting to reference a deleted object. 

Message id: GDM-100"

 Solution:

This is typically a model related issue that only affects one or some models.  In that case, please follow the the following steps to clean the problematic/corrupt model:

https://support.erwin.com/hc/en-us/articles/233414427-

However, if this issue affects ALL Mart models, then the issue may be that you do not have the correct version of erwin Data Modeler client installed. The erwin DM version needs to be identical to the version of Mart.  For example, if you try to connect from erwin DM version 9.8 to a 2019 R1 Mart, you will see the above error when trying to open any model from the Mart.  You can check the erwin DM version in Help -> About.  One way you can check the Mart version by signing into the Mart Admin page at the URL below (replacing localhost with Mart server hostname).

http://localhost:18170/MartAdmin/

If the Data Modeler and Mart versions, do not match, please install the correct Data Modeler version from the below URL.

https://support.erwin.com/hc/en-us/articles/360035642891-erwin-DM-Downloads-Guides-