It’s because you have two versions of COSMOS/Simulation installed at the same time (ie 2008 and 2009). Here is the fix SW told me to do (it worked for me):

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1) Search the drive with SolidWorks installations on it for the file
parametricobject.dll

2) Note the folder that each dll which shows up in the list is located.
You will have to determine which installation folder corresponds to
which version of SolidWorks. If you have multiple folders showing up
called SolidWorks (2) for example, you can find out which version it is
by searching for the file sldworks.exe and launching it to see which
version of SolidWorks starts.

3) Make sure SolidWorks is closed and access the command prompt. Type:

regsvr32 “[path to dll]”

In the above sample, [path to dll] would be replaced with the exact
location of the parametricobject.dll for the version you wish to use.
For example if you desired to use 2008, you would enter the path to the
parametricobject.dll in your 2008 installation directory:

regsvr32 “C:\Program Files\SolidWorks\COSMOSWorks\ParametricObject.dll”

This will ensure that the correct version of the dll is registered for
the version of COSMOSWorks you will be using once you start SolidWorks.
You may have to do this every time since dll’s can become registered and
unregistered frequently.

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I hope this makes sense. Feel free to contact me.

Phil Sluder