Nonadiabatic Coupling using SF-TDDFT method

Questions
#1

I tried to calculate the nonadiabatic coupling between the ground state and excited state ,but i am encountering with an error
Q-Chem fatal error occurred in module libmdc/newfileman.C, line 384:

FileMan error: End of file reached prematurely reading (272432) bytes in file FILE_SET_TMP_B_DC
Path: /home/sunandan/PCESML/SELVI/Benchmark/Non-adi-Dynamics/S0_S1/Ref1/non_dy/1211.0

I would appreciate any insights or suggestions regarding these questions. Thanks in advance
The following input are given below:

$molecule
read opt-S0.txt
$end

$rem
SPIN_FLIP true
UNRESTRICTED true
CIS_N_ROOTS 4
CIS_TRIPLETS false
SET_ITER 50
CIS_DER_NUMSTATE 2
CALC_NAC true
EXCHANGE bhhlyp
BASIS 6-31G*
$end

$derivative_coupling
1
0 1
$end

#2

When you use spin-flip methods such as SF-TDDFT, the ground state is a target SF state. The reference state denoted by the index “0” in your input file has a spin multiplicity that is greater by +1 compared to the SF target states. So, you may need to use “1 2” instead of “0 1” in the $derivative_coupling section.

#3

Thanks @kaushik for your suggestions