Why do I receive an error of the form "Error 430: Class does not support Automation or does not support expected interface" when I try to instantiate MATLAB 7.0 (R14) as a COM object in my Visual Basic program?

Question

MathWorks Support Team 2009-6-27

I am trying to call MATLAB as a COM object from Visual Basic. When I try to instantiate the object in my code, I receive an error of the form:

 Error 430: Class does not support Automation or does not support expected interface.

Answer 1

This bug has been fixed in Release 14 Service Pack 2 (R14SP2). For previous releases, read below for any possible workarounds:

This error can occur when MATLAB is not correctly registered as a COM object with the Windows registry.

To fix the registry perform the following steps:

1. From the machine's command prompt run the command "matlab /unregserver"

2. Wait for MATLAB to open

3. Close MATLAB

4. From the machine's command prompt run the command "matlab /regserver"

5. Wait for MATLAB to open

6. Close MATLAB

This process should refresh the registry and allow the objects to be instantiated correctly.