Is it common error or everyone having this issue?

Why i am facing this issue? any one faced this issue while creating self signed certificate for RBAC?
$ openssl x509 -req -in tej.key -CA ca.crt -CAkey ca.key -CAcreateserial -out tej.crt -days 366
140501751308736:error:0909006C:PEM routines:get_name:no start line:…/crypto/pem/pem_lib.c:745:Expecting: CERTIFICATE REQUEST