Database not found error occurs if I supress a virtual wall

why suppress the virtual wall in the study after solving?

at that point the results don't match the setup

database not found happens when the results are disconnected from the study, and I don't know if I expect it to happen from suppressing an element, but at the same time, your workflow isn't standard either

if this happens in any file any study, I would report to your var

workaround would be to not suppress the virtual since it seems strange to do it in the first place