GreenPois0n Jailbreak - Error Messages

I tried to Jailbreak my iPad 4.2.1 using the method below but found some errors on my iPad screen..
Anyone have this same problem?

unsuccessful in jailbreaking using Greenpois0n due to the following errors that present on the iPhone.
Unable to find gBdevList
Unable to find fs_mount
Unable to find fs_unmount
Unable to find fs_load_file

Updated:

Somehow, some people are able to Jailbreak it.