Activiti BPMN 2.0 designer Installation on Eclipse Error

[sundec19]

Please I need someone to assist me.

I got the error below while following the instruction contained in the User Guide on how to   install Activiti BPMN 2.0 designer on Eclipse version 3.6.2.


Cannot complete the install because one or more required items could not be found.
Software currently installed: Activiti Eclipse BPMN 2.0 Designer 5.8.1 (org.activiti.designer.feature.feature.group 5.8.1)
Missing requirement: Activiti Designer - Eclipse 5.8.1 (org.activiti.designer.eclipse 5.8.1) requires 'bundle org.eclipse.wst.xml.ui 0.0.0' but it could not be found
Cannot satisfy dependency:
From: Activiti Designer - Export BPMN 2.0 5.8.1 (org.activiti.designer.export.bpmn20 5.8.1)
To: bundle org.activiti.designer.eclipse 0.0.0
Cannot satisfy dependency:
From: Activiti Eclipse BPMN 2.0 Designer 5.8.1 (org.activiti.designer.feature.feature.group 5.8.1)
To: org.activiti.designer.export.bpmn20 [5.8.1]

[bardioc]

Hello,

check out if the update site for 'http://download.eclipse.org/releases/helios' is activated in your settings. If not, activate it or add it using the 'Add …' Button in the 'Install new software' dialog.

Greets,

Heiko