When I attempt to change the activity type on an activity I've uploaded, I get the following java error:
ajava.lang.NoClassDefFoundError: com/garmin/connect/activity/geoactivity/ActivityToGeoActivityInput
Is there a workaround?
I think the first thing to do is to fix your java error.
However, we have all been having this issue for some time now.There are multiple threads about not being able to change activity types. The best workaround is to change the activity type, export it; delete it; and reimport it.
However, if you're getting a java error you probably need to fix that first - probably with a java update.