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Ok Guys i got a solution for it The Problem was with my URDF File I had Not created a fixed Joint.

Also the first joint (Fixed type ) and Base_Link1_Joint (Revolute joint) must be at a same position

Say if x y z of fixed joint is 0 0 0.5 x y z of revolute joint must be 0 0 0.5.

If there is any deviation then gazebo model starts to appear shaky or not stable.

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