@KJ5IRF Ran into a similar issue yesterday, but I know the team has been looking into it
Now, if you have N3FJP, that works great to import your ADIF, and then export it as a Cabrillo file from there like @NO4D mentioned
If you’re like me, and not on a Windows machine, or just don’t own a copy of the N3FJP logger, theres a solution that worked for me that comes directly from the ARRL! You can click here to read it for yourself, but here is the quote directly from their site:
To convert your log into a Cabrillo formatted log for electronic submission, visit www.b4h.net/cabforms/ and select the event of interest. You can input your log data which will be converted to a Cabrillo formatted log for you (it will generate a log and return it to you), and then you can in turn submit your Cabrillo log online via the web app at contest-log-submission.arrl.org/.
Doing it this way worked perfectly for me to submit my log, with no errors.
Hope this works for you!
73!
Daniel W2DIY