Meaning: The .dll needs to be recompiled, or the .dll containing the ProgID in the To Do List error message is missing from the SharedContent folder.
Recovery:
Contact your system administrator to do the following:
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Recompile the .dll if needed.
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Place the Symbol in the SharedContent/Custom Symbols folder
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Start Project Management.
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Click Tools > Update Custom Symbol Configuration command. For more information, see Create or update the custom symbol configuration file in the Project Management User's Guide.
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Click Tools > Synchronize Model with Catalog, or manually update the To Do List entry. For more information, see Synchronize Model with Catalog in the Project Management User's Guide.