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Dear Users
I want to calculate optical properties using RPA method. In IPA calculations, the OUTCAR file contains frequency dependent function. But while coping with WAVECAR and WAVEDAR file from IPA calculations I have tried to calculate RPA based optical properties but I have observed zero values in real and imag part of dielectric functions.
ICAR for IPA Calculations:
ALGO = Exact
NBANDS = 64
LOPTICS = .TRUE.
CSHIFT = 0.100
NEDOS = 2000
ISMEAR = 0
SIGMA = 0.01
EDIFF = 1.E-8
NGX = 80
NGY = 48
NGZ =384
while for RPA calculation after coping WAVECAR and WAVEDAR file from IPA folder
ALGO = CHI
NBANDS = 64 (Take the same number of bands in the previous step)
ISMEAR = 0
SIGMA = 0.01
EDIFF = 1.E-8
LWAVE = .FALSE.
LCHARG = .FALSE.
! LRPA = .FALSE. (Set .FALAE. to include contributions from DFT exchange and correlation)

OUTCAR file is attached.

Please upload all the neccessary files according to the forum guidelines, so that we can better analyze your calculations.

Files are attached.

I reran your calculation using VASP.6.2 and got an error in the ALGO=CHI step with your setup.
Then I tried using a gamma centered KPOINTS file and the calculation worked properly (although I used a reduced k mesh).

So please try using a gamma centered KPOINTS file.
Also do the calculation in three steps:
First ALGO=NORMAL
Second ALGO=EXACT (with ISTART=1).
Third ALGO=CHI.