Problem when i formating sansa e250

[nixymen]

Hello ! everyone . I am from Viet Nam
I have one sansa e250 ( firmware 01.03.01H ) , and i was installed rockbox on that
And my problem is.. when I format ( setting > format ) then it restart,
sansa just display like this http://i568.photobucket.com/albums/s...y16/Anh019.jpg
"RockBox Boot loader
version : 5.0
Sansa e200
not partition file " then it to be thrown out

I've tried any way but it's not run
Please help me to fix that

Sorry , because my english is not good , can make U don't understand