One of the quick fix is IISRESET.
The issue may be caused by the OWSSVR.DLL file being corrupted on SharePoint server.
You can try to copy OWSSVR.DLL file from another WFE server to the production server. (Backup the OWSSVR.DLL before copying)
Location of the OWSSVR.DLL: c:\program files\common files\MicrosoftShared\Web server Extensions\12\ISAPI\ and looked for owssvr.dll