Please Help Heree, I Dont Understand What To Do, I Have very important documents on MyDocs. Please Help, In File Manager There is nothing

BusyBox v1.21.0 (Debian 1.21.0power2+thumb1) built-in shell (ash)
Enter 'help' for a list of built-in commands.

~ $ sudo gainroot
Root shell enabled


BusyBox v1.21.0 (Debian 1.21.0power2+thumb1) built-in shell (ash)
Enter 'help' for a list of built-in commands.

/home/user # umount /dev/mmcblk0p1
umount: can't umount /dev/mmcblk0p1: Invalid argument
/home/user # fsck -af /dev/mmcblk0p1
fsck 1.42.5 (29-Jul-2012)
dosfsck 3.0.12, 29 Oct 2011, FAT32, LFN

Unable to create unique name
/home/user #
/home/user # mount /dev/mmcblk0p1 /home/user/MyDocs
mount: mounting /dev/mmcblk0p1 on /home/user/MyDocs failed: Invalid argument
/home/user #