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Pretty sure I have root, can't install?

When I download, I get "Application not installed. Tetherblu could not be installed on this phone."

Running Android Dev Phone 1
dream_devphone-userdebug 1.5 CRB21 (pretty old?)

Can't download it..

When I use the barcode scanner, it brings me to the download history box. So, i press the one for Tetherblu, and it shows the downloading bar, and then a message shows up saying ''Application not installed. Tetherblu could not be installed on this phone.''

I am using the Sprint HTC Hero
I really would like to download and use this app, if anyone has anything that they can say to help me out, that would be great, Thanks.