I can't find no "optional=true" line in the plugin.xml. I'm posting the
contents of plugin.xml for UI below and am also coping the 
contents of the workspace log:

-----------Log-----------------
!ENTRY org.eclipse.core.runtime 2 1 Jan 27, 2004 11:46:32.750
!MESSAGE Problems encountered loading the plug-in registry.
!SUBENTRY 1 org.eclipse.core.runtime 2 1 Jan 27, 2004 11:46:32.750
!MESSAGE Plug-in "org.apache.avalon.MerlinDeveloperUI" was disabled due to
missing or disabled prerequisite plug-in "org.eclipse.ui.ide".

-----------------------------------------------------------


---------------------plugin.xml for UI--------------------

<?xml version="1.0" encoding="UTF-8"?>
<plugin
   id="org.apache.avalon.MerlinDeveloperUI"
   name="MerlinDeveloper UI"
   version="0.0.1"
   provider-name="Apache Software Foundation"
   class="org.apache.avalon.ide.eclipse.merlin.ui.MerlinDeveloperUI">

   <runtime>
      <library name="MerlinDeveloperUI.jar">
         <export name="*"/>
      </library>
   </runtime>
   <requires>
      <import plugin="org.eclipse.core.resources"/>
      <import plugin="org.eclipse.ui"/>
      <import plugin="org.eclipse.pde.ui"/>
      <import plugin="org.eclipse.swt"/>
      <import plugin="org.eclipse.jdt.core"/>
      <import plugin="org.eclipse.ui.ide"/>
      <import plugin="org.junit"/>
      <import plugin="org.apache.avalon.MerlinDeveloperCore"/>
      <import plugin="org.apache.avalon.MerlinDeveloperLaunch"/>
   </requires>


   <extension
         point="org.eclipse.ui.newWizards">
      <category
            name="%new.category.name"
            id="org.eclipse.ui.Merlin">
      </category>
      <wizard
            name="%new.blockDevelopment.name"
            icon="icons/full/ctool16/newjprj_wiz.gif"
            category="org.eclipse.ui.Merlin"
 
class="org.apache.avalon.ide.eclipse.merlin.wizards.NewMerlinProjectWizard"
            project="true"
 
id="org.apache.avalon.ide.eclipse.merlin.wizards.newMerlinProjectWizard1">
      </wizard>
      <wizard
            name="%new.convertProject.name"
            icon="icons/full/ctool16/newjprj_wiz.gif"
            category="org.eclipse.ui.Merlin"
 
class="org.apache.avalon.ide.eclipse.merlin.wizards.NewMerlinNatureWizard"
 
id="org.apache.avalon.ide.eclipse.merlin.wizards.newMerlinNatureWizard2">
      </wizard>
   </extension>

</plugin>




-----Original Message-----
From: andreas oberhack [mailto:[EMAIL PROTECTED] 
Sent: Tuesday, January 27, 2004 12:53 PM
To: 'Avalon framework users'
Subject: RE: Merlin Developer

Hi Vikas,

> 
> And I'm using Eclipse based WDSC 5.0 IDE actually. And the version of
> Eclipse Platform is 2.0.3.
> 
> Is this a know bug for Eclipse 2.x or what ?

The problem here is, that I'm using a "optional="true"" command in the
plugin.xml to get the Eclipse 2.x and 3.0 compatibility done.

But I think, this is only supported in 2.1.x upwards.

Could you please go to the MerlinDeveloperUI package, open the
plugin.xml and delete the line with the "optional="true"". 

Please also have a look at workspace/.metadata/.log. There should be a
message, pointing to the problem.

Tomorrow I will upload some doc enhancements, which will show how to
launch the container.

Thanks for your help!

Andreas 

> 
> Please advice. And yeah I have tried re-copying.
> 
> Thanks
> [Vikas Phonsa]
> 
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