Garmin TACX training app “graphQL error”

Since about a week, after selecting an activity in the Garmin TACX training app and starting it (blue/white arrow icon) a message box appears saying “GraphQL error”. I cannot do any activity. Tried several different ones, as soon as I try to start, the error message appears. 
I have a NEO smart bike (not plus) with the latest firmware (0.0.46).I have the Garmin TACX training app and a Garmin Connect account, all latest versions. Could do activities before without problems. 
Please help!