trouble jailbreaking my iphone 4 ios 5.0.1

[iLion15]

i have been trying for a few days to jailbreak my iphone 4 im running 5.0.1 and when i open redsnow to break it it starts off fine then when it goes to reboot it puts my iphone in recovery and says that redsnow cant fetch data or something like that is there anybody that can help me?