Retrieving COM class factory failed error: 80040154

Thank you for reading.

I am working on developing a piece of code which executes within and accesses data from a commercial radiation planning software (Eclipse). I'm attempting to have this application.exe also update some model parameters within a SolidWorks model.

Here's the problem: When attempting to open the SolidWorks application (SldWorks swApp = new SldWorks(); ) i get an error: "Retrieving the COM class factory for component with CSLID {xxx-xxx-xxx} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))."

I have also attempted the methods described here:

https://www.codestack.net/solidworks-api/getting-started/stand-alone/
After attempting these methods, I receive again the same error.

I understand that this means that the application is attempting to access something in the registry that isn't there, but it isn't clear what I should do to remedy this.

I am running Solidworks 2018 in Windows 7, using Visual Studio Community 2017 as my editor. The piece of code works on its own, and I believe I have all of the relevant Solidworks .dll's referenced properly in my model. Interestingly, if i run the same code as a .dll from within Visual Studio, Solidworks will actually open. This is done using the "SldWorks swApp = new SldWorks();" methodology (which is a part of the Solidworks API methods)

I have no build errors in my solution. I apologize if there is anything confusing in this, as I am new to C# and these APIs. I will do my best to clarify any questions.

I have attempted the methods here: C#: DLL is registered but COM error 80040154 still appear to no avail. Any help is greatly appreciated!
Thank you!

Try registering swpublished dll

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe" "C:\Program Files\SOLIDWORKS Corp\SOLIDWORKS\api\redist\SolidWorks.Interop.swpublished.dll" /codebase

You can also check if 32/64 bit registry has anything to do with your issue. Create a test project that will call new SldWorks() and run it first as 32bit then as 64bit.