VUGen 12.5 contantly errors and now doesn't work

Hi all,

I have recently installed LoadRunner 12.5 (build 1096) on WIndows7.  Not sure if it's the 32 or 64bit.  I don't recall being asked so I suppose it just automatically detected.

When I launch VUGen; record; run an existing script, I get the following error:

System.Object CoCreateInstance(System.Guid ByRef, System.Object, Int32, System.Guid ByRef)

Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))

Any ideas how to fix it?  The solutions I found were for v11x and didn't seem to apply to v12.5.

Many thanks,


  • Hi John,

    It may be a file corruption during installation. Have you tried re-installing LoadRunner?

    Can you provide more information:

    • What protocols are you using in the script?
    • Do other error occur?
    • Does the error show in a pop-up, or in the log? 

    If possible, share a screenshot of the error and the application log.