Eclipse "Dialog refresh" error in Ubuntu 8.x

I have been working on Ubuntu 8.x with Eclipse environment recently. If you are a Eclipse user, you might know that you can search a class file using "Open Type" dialogue by using shortcut "Ctrl+Shift+T" or in the right click menu. However, it started not working since a while ago. It prompt an error dialogue as below:



It has been very frustrating for me that I couldn't use that useful feature. So I started to investigate the problem.

I finally found that the reason that affect Eclipse is the "Assistive Technologies" is turned on. It seems it is unrelated. But it actually affect Eclipse (somehow?!?). So in order to make it works again, the "Assistive Technologies" has to be turned off.

To turn off, choose System->Preferences->Assistive Technologies, uncheck "Enable assistive technologies" as below:



Once finished, restart Gnome, it should work!