Meaning: The symbol definition entry is missing from the System Symbol Configuration .xml file.
Recovery:
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Enable the Error Log. See Error Logging.
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Click Synchronize out of date occurrences in workspace on the Window Tab.
Smart 3Dx displays the Synchronize Workspace with Catalog Dialog.
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Select the object in error, and then click Update.
The software updates the object and writes additional information to the Error Log.
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Open the Error Log and locate the Could not get Wrapper ProgID for the .Net component message. This message contains the missing Assembly name and Class name.
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Locate the .dll file associated to this assembly, and add it to one of the symbol share bin sub-folders.
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Start Project Management, and click Tools > Update Custom Symbol Configuration.
Only the project administrator can run Update Custom Symbol Configuration.