This message happens when opening RAM Frame module. Before updating there were no errors. Running Data Check does not return anything helpful. I am able to run the "Rebuild Mesh Data" and/or "Analyze" without getting the error message. The message only appears when launching the Frame module.
A backup of the model is created when it's converted if you need that. See: https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/3112/ram-ss-files-faq
Some users experienced a problem with E values on walls for converted models and other wall corruptions. For details see: https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/61922/corruption-of-wall-geometry-in-version-17-04
If you install 17.04.02 and reconvert the .backup you can prevent that. Release notes: https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/62690/ram-ss-v17-04-02-release-notes