An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Sitecore.Exceptions.ConfigurationException: Could not create instance of type: Sitecore.Data.Database. No matching constructor was found.
Sitecore 9 has the new role definition. This issue is due to in appropriate role setup in the web.config file. In my case I had a 9.1 XP scaled setup but on CM the role was default set to Standalone rather ContentManagement. Once switched it worked like a charm. Hope this helps.
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