This is a strange bug which I have not seen before and I can not
imagine how it occured. The fact that the error occured when all sets
went closed should be a pure coincidence. There are many examples of
courses where all sets are closed, e.g. http://webwork.math.rochester.edu/spring01-mth162/. The index for set 1 lists all the psvn's for set 1 and has nothing to do with due dates, etc.
I am assuming you didn't explicitly delete sets. This message will
occur if you delete a set, then use the browser's back button to return
to the Prof page (i.e. you do not reload or refresh the Prof page) and
ask for info on the set. This will also occur if you delete all sets
but then the error messages tells you how to fix this situation.
It seems that somehow your webwork_BD got corrupted. There are various
"recovery" techniques that are available and I should probably talk to
you off line about these (they have been used once in the last five
years to the best of my knowledge). Please try one thing for me. Run
export_webwork-database.pl to get a human readable version of the
webwork_BD (run it with no parameters and it will tell you the syntax
to use). Near the bottom of the output you will see the indexes. Here
is what a small one for set 0 looks like. The format is "login = psvn".
Do you have an index for set 1? For other sets?
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