It was a puzzle, if you are not aware of there is a predefined list of variables in RAD/RAS. If you see this error, try to add it in your RAD.

  1. Go to Window > Preferences > Plug-in Development > Target Platform > Application Server (Active) > Edit > Locations tab > Add

2. Select Directory and click Next button. Click Variables and find the ${mdm_bundles} from there and add by clicking OK.



There are some discussions here, which can elaborate more: