Issue sending TXC file

[EnricoBeltramo]

I have an issue sending TCX file.
At the end of transmission I have following error:
java.lang.NumberFormatException: Expected an int but was 2179799777 at line 1 column 17 path $.id

Debugging I found that happens when Strava anwer to upload with code 201 "Your activity is still being processed." that is considered error and there is an exception during parsing the answer.

Looking at:
https://developers.strava.com/docs/uploads/
this code should interpreted as success?