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Q: How to resolve Error 80400 on clicking Master Keys tab in Business Studio?

A:  If opening Business Studio and clicking “Master Keys” it reports the error “Unable to load Master Keys, Error 80400”, probably the hasp_windows_master.dll is missing from the folder “C:\Program Files\SafeNet\Sentinel HASP Server\Servers\Sentinel HASP Server”. Check the system where the Business Studio Server is installed and be sure that the hasp_windows_master.dll…