I can't get my norton antivirus to run,get message up saying Runtime Error R6025-pure virtual function call

everytime i try to get norton to scan, i get a message up, microsoft visual c ++runtime library
Runtime Error!
Program:c:\Program Files\common Files\Symantec Shared\N MAIN-EXE
R6025
-pure virtual function call

could someone explains what this means to me, thank you
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