Blend shape error, plz help

[mr540]

Im doing a lipsync animation. When i select the duplicated expression and then select the main model, then i go to Create Deformers ->Blend Shape. I get this error

// Error: No deformable objects selected.

Anyone know whts going on plz help

thanks

[Ajmooch]

I'm not very familiar with blendshapes, but here's a few ideas:

Make sure that the two models are the same vertex-wise but just have the vertices moved-If you've actually changed the geometry (like added an edge loop to one but not to the other) then it won't work,

Or try deleting your construction history, which seems to solve almost ALL of my problems.