Does anybody have experience in electric field calculations using vasp? I gave the electric field to a already relaxed structure and it shows 'electronic self consistency is not achieved'. I even tried NELM=300 but still the ground state energy has not been converged. If I put ISIF tag along with electric field tag, calculations ends abruptly showing error. Is there anything else we can do. Would it be right if I take the CONTCAR after giving electric field and relax it again using ISIF tags?