How to rectify this problem; what will be the exact issue? Even I tried the calculations for the same compound using different basis sets, but again, same issue.
The "Server Error Message #2070" in Gaussian usually relates to molecule structure issues, basis set incompatibility, convergence problems, or resource limitations.
Molecule Issues: Check for distorted geometry or steric clashes.
Basis Set: Try simpler basis sets like 6-31G(d) or 3-21G.
Convergence: Increase optimization cycles and use looser convergence criteria.