I am trying to install the ADT Plugin. I go to Help install new software in eclipse and then after selecting the development tool I get this error
Cannot com
There seems to be some version mismatch. Are you using eclipse 3.6.2 or older version?
http://developer.android.com/sdk/eclipse-adt.html mentions that ADT 16.0.1 requires eclipse version 3.6 and higher.
Also, just check if you have installed/updated the latest android SDK before updating the adt. That might help in your case.