I am using Enterprise Architect 10 and have created various add-ins before. This particular add-in shows the error mentioned in the Manage extensions sections.
The Key is getting created properly and i am using the correct assembly reference.
Just wanted to know if there is any special cause for this type of error.
This is very unfortunate. EA does not give you any hint except that cryptic message (before it even was just "Error").
However, I think that this registry error description can give you a hint. So go back and cross check your registry. Also make sure to enable debug prints that will give you information about the registry and the startup process.
If its indeed a class not registered error like Thomas Pointed out, try running this command in a command prompt running as administrator
regsvr32 "path to your dll"
I should also point out that this error could also mean that the name of the dll you specified in the registry key for EA might not be the same as the name of the registered DLL.
Adding the key only tells EA what to look for in the Registered dlls library, but you still need to register it to the dll library.
If you are debugging with visual studio, there is an option for making it register to the com library when you start debugging
I also had the "Missing" error with Enterprise Architect: "Missing - (Error: 0x800401f3)". I did several things trying to fix it. The problem might be one of the following:
For building your Assembly, you must run it as administrator (click windows start type "Visual Studio", right click -> Run as administrator). It is also best to use Rebuild, because it might say build skipped "all up to date".
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