title: Can't install WTP (Web Tools Platform) in Eclipse - something about missing dependencies...?
body: <p>I'm trying to install the WTP plug-in for Eclipse Luna (4.4.0), but I'm having some difficulties.<br>
  When I choose this:<br>
   <img src="https://i.stack.imgur.com/SGE3R.png" alt="enter image description here"></p>
  
  <p>and click Next, it says that it cannot perform the operation, and it shows me this:<br>
  <img src="https://i.stack.imgur.com/y2Kei.png" alt="enter image description here"></p>
  
  <p>When I choose "Show original error...", I get the following:<br>
  <img src="https://i.stack.imgur.com/tr1Qf.png" alt="enter image description here"></p>
  
  <p>Why am I getting this error and how can I finally install the WTP? </p>