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How can Unity Pro error "The thread is not assigned to any session. <err-0001-0168> Attempt to use sessions before Objectstore has been initialized. (err_no_session)" be corrected?

This error usually occurs when launching Unity Pro. The working drive specified in the registry may be incorrect.
Open the Registry Editor and go to the following path:

HKEY_CURRENT_USER\SchneiderElectric\Unity ProXL\ProductVersion\Options\UnityXL

Make sure the working drive is a valid drive, usually C:\.

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