During the import of the data from UBB.classic into UBB.threads beta 2, I saw some errors printed in the browser while processing the data.
I can't recall exactly in what step it was but some where in the beginning when it is converting the topics, or something like that.

I was however not able to see what the error was.

Are the import output logged somewhere?

Could it be possible to print the browser output into a log file so that it is possible to check for errors afterwards?

There is an error that occurs early in the process if you do not have the Calendar Hack installed, but it can be safely ignored.

I don't have that hack installed, so that is most probably what I saw, thanks.