A error about convergence criteria in ecp calculation


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Hello,
I have a problem about ecp calculation.

For the reaction of H2 and CO2 on Cu surface,I want use ecp module for Cu with a basis set of lanl2dz to calculate dft energy.But my output file give me a error:


This type of error is most commonly associated with calculations not reaching
convergence criteria

And here is my input file:

geometry noautosym noautoz nocenter
Cu                 0.00000000    2.95160200    8.34839300
...
C                  3.25685784    5.61827856   13.60806605
O 2.68555622 4.49796833 13.65378265
O 3.82815947 6.73858879 13.56234945
H 3.44983138 5.91855784 16.22378346
H 3.25429262 5.36816551 16.08655050
end

basis
 C  library 6-31g**   
H library 6-31g**
O library 6-31g**
Cu library "LANL2DZ ECP"

ecp
 Cu library "LANL2DZ ECP" 
end

dft
 xc m06-2x
end

task dft energy


I would appreciate that if you can give me a hint.