Keeping getting sync error "There was an error syncing with Garmin Connect" Need help

I have a activity that I just cant sync. It is now on my phone and it is a activity from few days ago. After that, all the activities are able to sync.

On my Android app, it doesnt say any error. But on the Garmin Express on the PC, it say "There was an error syncing with Garmin Connect".

Please help on how to get this one activity sync up.

Thank you!
  • I fix one of my activities file .FIT .. the file was not corrupt at all but the Android and my PC was not able to sync it. WHY? Any clues Garmin ??? So this is what I did below.

    I hook my watch to my PC. Go to the watch thru the USB and in the "Activity" of Garmin, there are a bunch of .FIT file. Look for the date that it is missing and having your problem.

    Log into Garmin connect on the website. Go to Dashboard and All the Activities and IMPORT that .FIT file. It works for me! Now I see my activity.

    BUT .. when I sync on the Garmin Connect on my PC, I still get that "Sync Error" message. How do I get rid of this? Thanks!