cannot mount boot archive!!

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grub>cat (hd0,
possible partitions are
poartition mun;0,Filesystem type unknow,partition type 0x7
poartition mun;2,Filesystem type is fat,partition type 0x1c
poartition mun;3,[BSD/SOLARIS sub-partitions immediately follow]
    BSD/SOLARIS poartition mun:'a',  Filesystem type is ufs,partition type 0xbf
   BSD/SOLARIS poartition mun:'b',  Filesystem type unknown,partition type 0xbf
   BSD/SOLARIS poartition mun:'c',  Filesystem type unknown,partition type 0xbf
   BSD/SOLARIS poartition mun:'h',  Filesystem type is ufs,partition type 0xbf
   BSD/SOLARIS poartition mun:'i',  Filesystem type unknown,partition type 0xbf
   BSD/SOLARIS poartition mun:'j',  Filesystem type unknown,partition type 0xbf
poartition mun;4,Filesystem type unknow,partition type 0x7
poartition mun;5,Filesystem type is fat,partition type 0xb
grub>root (hd0,3,a)
Filesystem type is ufs,partition type 0xbf
grub>kernel /platform/i86pc/multiboot
[Multiboot-elf <0x1000000:0x13ab3:0x1290d>shtab=0x1027258 entry=0x1000000]
grub>boot

diskread:reading beyond end of ramdisk
start=0x2000, size=0x2000
failed to read superblock
diskread:reading beyond end of ramdisk
start=0x8000, size=0x800
failed to read superblock
panic: cannot mount boot archive
press any key to reboot

aric

Please try :
grub>kernel /platform/i86pc/multiboot
grub>module /platform/i86pc/boot_archive
grub>boot

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the problem also occured