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4,913 total views, 1 views today While creating the calculated column in SharePoint, sometimes we may get the below error: “Failed to save modifications to the server. Error returned: ‘An unexpected error occurred (file ‘tmmdmodeltm.cpp’, line LineNumber, function ‘MDModelTM::CreateHierIterRequest’).” In this post, I will show how to fix “failed to save modifications to the server” error while