What is the source of this error after the end of calculation of vc-relax: "Error in routing bfgs(1): step_old is NOT normalized"?

I am trying to calculate vc-relax of (2,2) Carbon Nanotube in Quantum Espresso. I have simulated it many times but the same error occurred. For your clear understanding, I give relax input file....

07 June 2020 7,051 0 View