Why am I getting "Displacement Error Norm" in message window? 

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Answer:

The "Displacement Error Norm..." that is displayed is not about any error in the model. But it is the difference between the solution of the iterations. It is a check to determine the accuracy of the solution.
For a better understanding of such calculations, kindly refer the link below.
http://www.sd.rub.de/downloads/Convergence_FEM.pdf