Not working after reboot

I was running hashcat using command
"hashcat -m 2500 /root/file.hccapx /root/rockyou.txt"

and it was running properly when suddenly there was a powercut and now after the power came back i tried running the same

but now it gives me an error "Cannot read /root/.hashcat/sessions/hashcat.pid". i tried changing the hccapx file's name but still the same error. Kindly guide me to the solution.
Thanks