If you are using the nightly builds of Lightning on Thunderbird you may occasionally hit an update for Lightning that causes an error when it tries to open your calendar file. When you go into Lightning (your calendar on TB) the calendar will not be there, so you can’t delete it or do anything to it. So the error will occur every time you open TB.
To get rid of this dud calendar file (yes, you will lose whatever was stored in there) you need to close TB and once it is closed delete the storage.sdb file in your profile directory. TB will then create a new storage.sdb file when you next start it up.
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