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It would help a great deal to see the actual movie. Tweening on the timeline will only work for one item in any given layer. If you are using a motion tween for either text or a movieClip then you need to have the same item in the each keyframe for the tween to work. If you are using a shape tween, then you should only have one shape in each keyframe. If you are using Flash CS4 and are using the "new" timeline tweening, most of the rules above apply. The difference is that you set the tween before you define the second keyframe.
Hey clemas I had the same problem as you. Are you watching these tutorials? How to create 2D animation using Animate CC | Adobe Animate CC tutorials . I found out that I hadn't converted them into separate symbols. f8 is the shortcut. Hopefully this helps.
Just went trough the same problem clemas
I'm glad the first answer fixed your problem! For me though, the above answers didn't work (I already tried them and was still stuck with that error message) then I tried this and it fixed it:
Select all the separate Symbols (or Instances) of your Character (or object) with the selection tool, the in the menus, select Modify/Break Apart (or Command-B on a Mac, or Control-B on a PC)
Then re-try your Motion Tween.
Hope this helps!