Error Report

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Error Code: 
4
Error Message: 
Operation details
Installable Units Reported: 
org.zeroturnaround.eclipse.feature.feature.group,7.1.6.RELEASE
Detailed Message: 
Your original request has been modified. "JRebel (required)" is already installed, so an update will be performed instead. Cannot complete the install because one or more required items could not be found. Software being installed: JRebel for Java EE 7.1.6.RELEASE (org.zeroturnaround.eclipse.wtp.feature.feature.group 7.1.6.RELEASE) Missing requirement: JRebel for Java EE 7.1.6.RELEASE (org.zeroturnaround.eclipse.wtp.feature.feature.group 7.1.6.RELEASE) requires 'org.eclipse.jst.server_ui.feature.feature.group 0.0.0' but it could not be found