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What version of Wing is this and on what OS? Submitting a bug report from the help menu with the error log may show us what is going on.
In any case, most likely switching to the non-remote project and then restarting Wing will solve it. You can use Edit > Command by Name with the command restart-wing to do that and return to the same place you're at before restarting.
Right-click on the toolbar to add an icon for that command if you end up having to use this work-around often, or add a key binding with the User Interface > Keyboard > Custom Key Bindings preference.
However, if this is Wing 10 we should try to diagnose and fix it.