It sounds like you need the getpass.py program. Here is how I believe I got mytube working:

1)enable maemo extras and extras devel.
2)install mytube
3)install mytube patch (this installs getpass.py and an obsolete youtube-dl-x)
4)install rootsh (to gainroot to update the youtube-dl-x in the place where it is installed by the patch)
5)download the latest youtube-dl-x.tar file from this thread
6) to untar the tar: type 7)to becomeroot type 8)to copy the youtube-dl-x file (note the lack of an extension) 9)make it readable and executable by everyone: 10)exit root just to be careful 11) start mytube as normal from the menu
12)from mytube's context menu choose preferences/more
13)choose the youtube-dl tab
14type in the following:15)press the apply button
16)press the close button
17)pray. This step is optional for non believers
18)attempt to download a video
19)tell us how it went