Activity lost on TomTom Sport App and folder is empty on iTunes File Sharing

After the activity I connected my Multisport watch with the Sports app on my iPhone via bluetooth. Everything went well the status bar reached to 100% but the activity homepage didn't show the activity. I found a wifi and opened the app but nothing happened. Then I tried to sync the watch again but the app is saying it is up to date. Then I connected my phone to iTunes and looked at file sharing but the folder is empty. So where is my marathon data now? I think it should be still at the watch but how can I transfer the file to my mac or iPhone again?
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Superusers
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