PO approval not working

PO approval not working

I have a technician that receives request for purchase order approvals and when he logs into service desk under My View, he sees the items that require his action. All of his items are PO's waiting on approval but whenever he clicks on the Take Action button, he gets the following error:



I have cleared the cache on his browser and still get the same error. He is using IE11 and we are running ServiceDesk Plus 9.2 Build 9211 with an MSSQL database.
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