Error in SSIS Script Component

Development environment : SQL Server Business Intelligence  Development Studio 2008
I have developed SSIS package to insert/update records to production Database. In this case I'm using  a Script component to call a Stored Procedure to do the data access. I putted a User defined variable into
ReadOnlyVariables container. When execute the package I got the following error.
ERROR:
Unable to cast COM object of type 'System.__ComObject' to interface type 'Microsoft.SqlServer.Dts.Runtime.Wrapper.IDTSVariables100'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{22992C1D-393D-48FB-9A9F-4E4C62441CCA}'
failed due to the following error: The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD)).
at Microsoft.SqlServer.Dts.Runtime.Wrapper.IDTSVariables100.Unlock()
at Microsoft.SqlServer.Dts.Pipeline.ScriptComponent.UnlockReadOnlyVariables()
at Microsoft.SqlServer.Dts.Pipeline.ScriptComponentHost.PostExecute()
Appreciate if any assistance regarding this!
Kind Regards, 

What is your readonly variable meant to store: a value to be supplied as argument to the stored procedure?
Either way, I agree with SSISJoost, try to use Execute Sql Task, I prefer to make as much as possible use of the SSIS components.
Maybe the reason why you write a script is that you assume one cannot call an EXEC stored procedure immediately in a data source in a data flow component. But you can prepare the Exec statment in a string variable and then use that string variabl in
a Oled db source with SQL command as variable.
Jan D'Hondt - SQL server BI development

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