Clock [Q] E:Can't mount /storage/sdcard0

**VIBRANT issue** URGENT HELP REQUIRED**

My vibrant running Vanir (JB 4.3) was just sitting on the table when suddenly I realized its rebooted to recovery. When I try to reboot it, it just gets stuck on the "Vibrant" flash screen.

I tried to reboot to recovery and when trying to install zip from internal sd card i am getting message -

E:Can't mount /storage/sdcard0

Has my internal SD Card gone? Any way to get it working again?