dft optimization failed

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hi,
I'm having issues with optimizing this input file, hope someone can help me with this.
Thanks.

start cis_butadiene_2_b3lyp_6311ags

geometry units angstrom
C                 -1.25395848   -1.57241976   -0.00000000
H -1.52236717 -2.03945087 -0.92452081
H -1.51962538 -2.03468016 0.92770492
C -0.57868418 -0.39744246 -0.00000000
H -1.11184792 0.53026246 -0.00000000
C 0.96131582 -0.39744246 0.00000000
C 1.63659013 -1.57241976 0.00000000
H 1.90317201 -2.03627222 0.92664718
H 1.49723316 0.52867449 0.00000000
H 1.90317201 -2.03627222 -0.92664718
symmetry c2v
end

basis
H library 6-311+g*
C library 6-311+g*
end

dft
xc b3lyp
end

driver
maxiter 2000
end

task dft optimize
task dft freq

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EAF file 0: "./cis_butadiene_2_b3lyp_6311ags.aoints.00" size=745537536 bytes


              write      read    awrite     aread      wait
----- ---- ------ ----- ----
calls: 2159 37 0 43360 43360
data(b): 1.13e+09 1.94e+07 0.00e+00 2.27e+10
time(s): 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00
rate(mb/s): 0.00e+00 0.00e+00




Parallel integral file used   22738 records with       0 large values

driver: task_gradient failed        0
------------------------------------------------------------------------
There is an error related to the specified geometry
------------------------------------------------------------------------
For more information see the NWChem manual at http://www.nwchem-sw.org/index.php/NWChem_Documentation


For further details see manual section:                                                                                                                                                                                                                                                                
driver: task_gradient failed 0


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