# Plug-in org.rubypeople.rdt.debug.ui was unable to load class

**URL:** <https://www.ruby-forum.com/t/plug-in-org-rubypeople-rdt-debug-ui-was-unable-to-load-class/103594>\
**Category:** Ruby\
**Created:** [May 8, 2007, 7:55am UTC](https://www.ruby-forum.com/t/plug-in-org-rubypeople-rdt-debug-ui-was-unable-to-load-class/103594 "2007-05-08T07:55:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![CsO](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/df705f/32.png) [@CsO](https://www.ruby-forum.com/u/CsO)\
**Post date:** [May 8, 2007, 7:55am UTC](https://www.ruby-forum.com/t/plug-in-org-rubypeople-rdt-debug-ui-was-unable-to-load-class/103594/1 "2007-05-08T07:55:29Z")

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Hiya,

I’m following the tutorial at:

> **[O'Reilly Media - Technology and Business Training](https://www.oreilly.com)**
>
> Gain technology and business knowledge and hone your skills with learning resources created and curated by O'Reilly's experts: live online training, video, books, our platform has content from 200+ of the world's best publishers.

I’ve got:

Eclipse SDK Version: 3.2.2 Build id: M20070212-1330  
ruby 1.8.6 (2007-03-13 patchlevel 0) [i386-mswin32]  
RDT Version 0.9.0.200704141430RC1

Basically the latest stable stuff.

When I try Window-\>Preferences Ruby\>-Installed Interpreters, I get:

Plug-in org.rubypeople.rdt.debug.ui was unable to load class  
org.rubypeople.rdt.internal.debug.ui.preferences.RubyInterpreterPreferencePage.

The other options in the Ruby subtree behave similarly.

Any ideas?

Thanks.

---

<div class="post-metadata">

**Author:** ![CsO](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/df705f/32.png) [@CsO](https://www.ruby-forum.com/u/CsO)\
**Post date:** [July 2, 2007, 3:47pm UTC](https://www.ruby-forum.com/t/plug-in-org-rubypeople-rdt-debug-ui-was-unable-to-load-class/103594/2 "2007-07-02T15:47:18Z")

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I’m getting the same error. Does anyone here know how to resolve this?

Thanks!  
-Steve-

CsO wrote:

> Hiya,
> 
> I’m following the tutorial at:
> 
> [http://www.oreillynet.com/pub/a/ruby/2007/04/26/ruby-on-rails-meets-eclipse.html](http://www.oreillynet.com/pub/a/ruby/2007/04/26/ruby-on-rails-meets-eclipse.html)
> 
> I’ve got:
> 
> Eclipse SDK Version: 3.2.2 Build id: M20070212-1330  
> ruby 1.8.6 (2007-03-13 patchlevel 0) [i386-mswin32]  
> RDT Version 0.9.0.200704141430RC1
> 
> Basically the latest stable stuff.
> 
> When I try Window-\>Preferences Ruby\>-Installed Interpreters, I get:
> 
> Plug-in org.rubypeople.rdt.debug.ui was unable to load class  
> org.rubypeople.rdt.internal.debug.ui.preferences.RubyInterpreterPreferencePage.
> 
> The other options in the Ruby subtree behave similarly.
> 
> Any ideas?
> 
> Thanks.