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I had a user call in telling me she was getting a bizarre error message when trying to send an email in Lotus Notes. The error message said “Collection Container is NULL”.
As informative as many of Lotus Notes’ error messages, this one, at least was displayed in English. Believe me, trying to translate error messages back from Norwegian to English is not as simple as it may sound…
Browsing the web, I found other people who had had the same problem, related to Category fields, as well as ODBC connections. The suggested solution was as simple as it was effective; restart Lotus Notes.