Please help on grid certification,THANKS

i have problem on using grid certication, i try to create grid proxy, the error show as;“grid-proxy-init”; “Error with certificate filename: The user cert could not be found in: 1) env. var. X509_USER_CERT2) $HOME/.globus/usercert.pem3) $HOME/.globus/usercred.p12”. Do you have any idea about this? thank you very much .

Have you created the usercert.pem and userkey.pem files?