Elic18

Hi I have Corona 4G XBOX360 which i need to update. I dumped my NAND with 360 simple launcher and its size is 49.1MB I extracted my CPU key with Dashlaunch. when I run XEbuild 2.098 I'm following the tutorial per step 4 but the program refuses to generate the file, see pictures detailing my input data and the error message: I'm at loss on how to proceed. any help will be appreciated?