non linear solver fail to converge

[A123-bansal123]

Help me in removing this error. Non linear solver fail to converge after 11 iteration. what we can use instead of direct solver for solving non linear problems?

firedrake:WARNING No comm specified for VectorSpaceBasis, COMM_WORLD assumed
Traceback (most recent call last):
  File "circle.py", line 58, in <module>
    solve(F == 0, up, bcs=bcs, nullspace=nullspace)
  File "PETSc/Log.pyx", line 115, in petsc4py.PETSc.Log.EventDecorator.decorator.wrapped_func
  File "PETSc/Log.pyx", line 116, in petsc4py.PETSc.Log.EventDecorator.decorator.wrapped_func
  File "/home/aparna/software/firedrake/src/firedrake/firedrake/adjoint/solving.py", line 53, in wrapper
    output = solve(*args, **kwargs)
  File "/home/aparna/software/firedrake/src/firedrake/firedrake/solving.py", line 129, in solve
    _solve_varproblem(*args, **kwargs)
  File "/home/aparna/software/firedrake/src/firedrake/firedrake/solving.py", line 177, in _solve_varproblem
    solver.solve()
  File "PETSc/Log.pyx", line 115, in petsc4py.PETSc.Log.EventDecorator.decorator.wrapped_func
  File "PETSc/Log.pyx", line 116, in petsc4py.PETSc.Log.EventDecorator.decorator.wrapped_func
  File "/home/aparna/software/firedrake/src/firedrake/firedrake/adjoint/variational_solver.py", line 90, in wrapper
    out = solve(self, **kwargs)
  File "/home/aparna/software/firedrake/src/firedrake/firedrake/variational_solver.py", line 282, in solve
    solving_utils.check_snes_convergence(self.snes)
  File "/home/aparna/software/firedrake/src/firedrake/firedrake/solving_utils.py", line 138, in check_snes_convergence
    raise ConvergenceError(r"""Nonlinear solve failed to converge after %d nonlinear iterations.
firedrake.exceptions.ConvergenceError: Nonlinear solve failed to converge after 11 nonlinear iterations.
Reason:
   DIVERGED_DTOL

[dham]

There's no such thing as a direct solver for nonlinear problems. What Firedrake does is a version of Newton in which each linear solve is (by default) solved directly. Here it's the outer, nonlinear, solver which is failing, not the direct solver inside. This probably means that your problem formulation has issues such that it is ill-posed. The first place to look is the problem you are specifying, not the solver.

[A123-bansal123]

okay