Classic Custom Object List View Not Able To Render Lookup Values

Products

• Clarity PPM On Premise

Issue/Introduction

When accessing a custom object list view and clicking on any lookup value to edit/set, the following error appears:
[en - Error occurred, please contact system administrator]

When trying to configure the list view, the list filter section shows attributes that cannot be identified.
It just shows [none] 

Resolution

As restoring defaults does not work, the following will need to be performed as the only resolution to resolve the corrupted view:

1. In the Classic object view, remove all the configured attributes in the current list filter.
2. One-by-one, add each attribute back.