That's a Scheme error so generally means there's a setting missing somewhere. Depending on what you set/reset/unset/changed and in what order you may have managed to activate an option that's not got a value associated with it. Check through all of the boundary conditions to see if you can find a blank selection. Right-click on Boundary Conditions to List Modified Settings as that may highlight the issue.Â
If you have corrupted the case you may need to read the mesh in and set up from scratch.Â
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