The Oracle listener and database services must be running when you create an MW workspace.
Problem:
Creating a new workspace fails with the error "Operation is not allowed when the object is closed." The error occurs at the "Create table" step.
Resolution:
Start the Oracle listener and Oracle database services, then create the workspace:
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Choose Start > Settings > Control Panel > Administrative Tools > Services (or its equivalent on your system).
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In the Services window, select the Oracle listener service and choose Action > Start, then select the Oracle database service and choose Action > Start.
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Create the workspace.
Note: Check with your DBA for assistance identifying the services.