What steps will reproduce the problem?
1. Load existing version of Atlas.
2. Load new Major Cities Mod (7/21)
3. Watch it crash.
What is the expected output? What do you see instead?
Atlas disables Major Cities on load, stating it is outdated. Ironic, since MC is the only up to date module
What version of the product are you using?
Do you have an error log of what happened?
Please provide any additional information below.