Error while trying to configure Fields section

Document ID : KB000098848
Last Modified Date : 30/05/2018
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Issue:
Receiving error while trying to accessing the 'Fields' section against Properties view.

Steps - 

1.  Open Idea Object
2.  Go to View tab
3.  In Ideas Properties View click 'Fields'

Expected Result - Opens the View Idea Properties - Property Fields

Actual Result - Receive error "Unable to process request - Server or Network Error"

app-ca.log file references error - 
"Sequence contains more than one value; Java method expects only one"
Environment:
15.4
Cause:
Duplicate values in the Idea Properties View.

You can see this by going to View>>Idea Properties>>Edit Property Layout
Resolution:
Restore Defaults in Idea>>Views