Maximum number of Newton iterations reached

I have imported a 3D meshed model from simpleware to COMSOL 4.3b.
Some of the materials of the model are Hyperelastic, Neo-Hookean.
While running the model via Direct Solver at 99% of progress there is an error:

Maximum number of Newton iterations reached
Returned solution is not converged.
-Feature: Stationary Solver1 (sol1/s1)
-Error: Failed to find a solution

Could you please help me how I can interpret this error and what the solution is?