Thanks for your reply. (The last thread is not prompting any reply button

I actually did that what you told. However, I am getting the error in the screen shot.
I am tar-ring the BSE report file, double_grid ndb, ndb.qp @ 300K and electron-phonon pw out files. The BSE r-file tells that it has taken the double-grid, but it stops when doing the inversion (-i). Can you please help me out...
Regards,
Sitangshu