Today the guys at Endomondo changed their backend code, and as a result, my apps are now unable to upload. Endomondo does not support third party apps, and the integration is always particularly nasty (which is why I declared it to be a "permanent beta"). From a quick look, it's not going to be trivial to fix this issue, as they radically changed the code and made scripting harder.
On top of that, I'm in the middle of moving to a new apartment, so things are a little crazy right now. I'll try to find the time to look into this, but I can honestly expect that it might take a couple of weeks (sorry guys).
Please follow sportablet on facebook or twitter to get updates on this, or check this post regularly, I'll post any update here too.
Meanwhile, what you can do is:
- save to sd card in native format and then upload manually
- connect your endomondo account with your garmin connect account. This is comfier anyway (if you upload to connect) because you get your data in both places with a single upload. See for instance https://support.endomondo.com/hc/en-us/articles/203483026-Uploading-workouts-to-Endomondo-from-a-Garmin-device