Convergence problem...


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Hi, I'm having trouble getting optimizing a system..
It gives the error as

dft optimize failed                                                                     0
------------------------------------------------------------------------
This type of error is most commonly associated with calculations not reaching convergence criteria

This is the inout (.nw) file I'm using ..

start ho_hocl

geometry units angstroms
O                  0.33520249    2.39077715   -0.00683931
H -0.37981087 0.74868511 0.17285391
O -0.82593007 -0.08154900 -0.00959877
Cl 0.27430978 -1.31115211 -0.00263665
H 1.29229047 2.31606903 -0.00797856
end

basis
  • library 6-311++G**
end

dft
mult 2
xc m06-2x
iterations 2000000000000
end

task dft optimize
task dft freq

Hope someone can help me with this.
Thanks a lot.