Technical Solutions

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?

Date Last Modified: Friday, June 26, 2009

Solution ID:		1-S09OT
Product:		MATLAB® Builder for COM
Reported in Release:		R14
Fixed in Release:		R14SP2
Platform:		Windows
Operating System:		Windows Any

 

Subject:

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?

Problem Description:

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.

Solution: 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.

 

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