Error while using snapshot to create a form

I am trying to create a form out of an existing class that I built using WindowBuilder in Eclipse. Now when using snapshot to create the form it throws an error - Read timed out.

Console:

SnapShooter listening on port 45579
SnapShooter connection accepted
Sending response: 1;javax.swing.JFrame;;Test Engine
.

Sending response: 2;javax.swing.JPanel;;
.

Sending response: 3;javax.swing.JLabel;;Username
4;javax.swing.JLabel;;Password
5;javax.swing.JPasswordField;;
6;javax.swing.JButton;;Login
7;javax.swing.JButton;;Clear
8;javax.swing.JTextField;;
.

Sending response: .

Sending response: .

Sending response: .

Sending response: .

Sending response: .

Sending response: .

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.intellij.util.ReflectionUtil (file:/snap/intellij-idea-ultimate/79/lib/util.jar) to method javax.swing.plaf.basic.BasicTextUI.modelChanged()
WARNING: Please consider reporting this to the maintainers of com.intellij.util.ReflectionUtil
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Sending response: <?xml version="1.0" encoding="UTF-8"?>
<form xmlns="http://www.intellij.com/uidesigner/form/" version="1"/>

End of stream receiving command