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i am now model soil pile interction with 3D model, the pile is used beam element ,soil is used the solid elements and between two body use rigidlink element and the interface element use zerolength3D elements. but this model now has some error, but i cannot find the reason. i simpled my coding below...

i am now model soil pile interction with 3D model, the pile is used beam element ,soil is used the solid elements and between two body use rigidlink element and the interface element use zerolength3D elements. but this model now has some error, but i cannot find the reason. i simpled my coding below...