ssl error using .crt file

[Pankaj More]

cant sync an imap server using custom .crt certificate

Error:

 [Errno 336265225] _ssl.c:347: error:140B0009:SSL
routines:SSL_CTX_use_PrivateKey_file:PEM lib

Config:
in .offlineimaprc

[Repository cse-Remote]
type = IMAP
remotehost = imap.cse.iitk.ac.in
remoteuser = pankajm
remotepass = password
remoteport = 993
ssl = yes
sslclientcert = /home/pankajm/.mutt/certificate.crt
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