mount file system

[xiaotailang]

I compile the File system mount example with the config options likes this: [] File system mount example
[] Use block device
(/dev/mtdblock0) Block device name I can not mount sucess when run mount cmd in console ,and some error info as follow: nsh> mount
mount_main: mounting vfat filesystem at target=/mnt/fs with source=/dev/mtdblock0
mount_main: mount() returned -1 i have look the error code it is mean Not owner but i can not understand it, so i need some help.