Appian Eclipse Development URL not working

Both below urls not working. pleas ehelp to setup plugin development on Eclipse

 

1. http://forum.appian.com/extras/developer_edition/site.xml <Not working>

2. https://forum.appian.com/suite/wiki/73/Appian_Plug-in_Creator_for_Eclipse <Not working>

3. http://s3.amazonaws.com/appianplugins/eclipse/update/site.xml

getting below error

Cannot complete the install because one or more required items could not be found.

Software currently installed: Appian Developer Edition 6.5.1.201103171122 (com.appiancorp.eclipse.feature.group 6.5.1.201103171122)

Missing requirement: Appian Plug-ins 6.5.1.201103171122 (com.appiancorp.eclipse.core 6.5.1.201103171122) requires 'bundle org.apache.commons.lang 2.3.0' but it could not be found

Cannot satisfy dependency:

From: Appian Developer Edition 6.5.1.201103171122 (com.appiancorp.eclipse.feature.group 6.5.1.201103171122)

To: com.appiancorp.eclipse.core [6.5.1.201103171122]

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