FTP connects to XBOX but problems with renaming etc

Ok I am having issues sending files to my XBOX and renaming files via FTP etc. Now some files get sent over just fine but others just wont send correctly. Like for example I went to send all my N64 roms over and it would only send the first 30 or so then I would get a ftp error. I tried both FlashFXP and CoreFTP. I connect just fine the directories are all there. Its not a filename issues because I shortened the names etc. My computer and XBOx are connected to a netgear router (which is being used as a hub) which is connected to my main router. I really wanna know why I cant rename files and why some files go over and some dont. The ftp progs are in passive mode. I get a million error codes even when files are trasnfering correctly. Blah I know I am being vague and all but I just wanna get this to all work 100% its a massive pain turning your XBOX into the ultimate gaming machine when there are little kinks like this.

update: ok so when I first connect it seems to rename a couple directories and files fine but then it stops working and gives me this error.

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this is in SMARTftp btw

also tried it via windows here is the error as it appears

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