I am trying to find a transition state using QST2 with b3lyp, but I am getting the following error:

"New curvilinear step not converged.

***** Convergence failure in GTrans *****

Try using 3 structures as input for

QST transition state search"

The input line is as follows:

# opt=qst2 b3lyp/6-31g(d) nosymm geom=connectivity SCF=tight

Herewith I have attached my input file.

If you could please let me know how to solve this error.

Thank you.

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