It seems that the only errors you get are the pexpect one and the python-tk one, althought they are not needed for the attack... Try an apt-get install pexpect, but I don't think it will do much. Is your python up-to-date? Sorry but I can't really think about any cause for your problem, if you have carefully followed the guide and you're using the modified kernel-power or kernel-power v47 wifite should work properly, you are the first encountering problems.