Fix FIT File Data so that imports to WKO5 Work
Since the end of July, imports of completed workouts from TpV to WKO5 have been failing.
The error from the WKO5 log is:
[2026-09-02 13:29:59] [SYNC] * Downloading changes to workout (3905161201;2026-09-01T00:00:00;1.5 hr Z5 workout 6x3 minute V02 Max intervals.)
[2026-09-02 13:29:59] [SYNC] Downloaded 917C262C4A07732320260901151157_s.fit.gz size 286297 bytes for athlete 2601315 workout 3905161201
[2026-09-02 13:29:59] ERROR: Fit file integrity check failed for 598479911.fit. FIT decode error: Invalid Developer Field Size
[2026-09-02 13:29:59] [FIT2] Error converting 598479911.fit.
This has been happening consistently for every workout I complete in TpV since the end of July, but worked prior. If I used another app such as TrainerRoad or Zwift to complete my workouts, I do not have this issue.
Brett Ramdeen
shared this idea
Many thanks for letting us know about this, and your support for TrainingPeaks Virtual.
I'm delighted to say that we've now resolved the WKO5 sync issue. The fix has been fully deployed live across all our servers and verified as working again.
All new activities going forward should now sync correctly without any additional action required.
For historical activities affected by this issues, you can repair files using tools such as fitfiletools by just loading and immediately re-saving the FIT file before importing into WKO5.
Thank you for your patience with this - if you see any further issues, please do let us know.