Erase successful, but not automatically formatting. Can't determine partition type - Jelly bean 4.1.2 with Nexus S

While I ran the command - fastboot flashall -w I got the following error - -------------------------------------------- Bootloader Version...: I9020XXLC2 Baseband Version.....: I9020XXKI1 Serial Number........: 3334E1630CFF00EC -------------------------------------------- checking product... OKAY [ 0.001s] sending 'boot' (3964 KB)... OKAY [ 0.693s] writing 'boot'... OKAY [ 0.603s] sending 'recovery' (4308 KB)... OKAY [ 0.541s] writing 'recovery'... OKAY [ 0.652s] sending 'system' (173123 KB)... OKAY [ 22.336s] writing 'system'... OKAY [ 24.196s] erasing 'userdata'... OKAY [ 0.243s] formatting 'userdata' partition... Erase successful, but not automatically formatting. Can't determine partition type. OKAY [ 0.001s] erasing 'cache'... OKAY [ 1.684s] formatting 'cache' partition... Erase successful, but not automatically formatting. Can't determine partition type. OKAY [ 0.001s] rebooting... finished. total time: 50.956s I'm trying the build Android jelly bean 4.1.2 in Nexus S phone. Could anyone help please?