Package manager Console add-migration addCategoryToDatabase

Hello,

For some reason while I’m trying to write the function add-migration addCategoryToDatabase,it shows that the PM failed. ASP.NET Core MVC Course (.NET 5) - YouTube timeframe: 1:06:54. Maybe the names are different,butI also Installed the neccessary microsoft entity tools package.I’m completely lost.Thank you for your information.
https://csharpforums.net/attachments/screenshot-2021-08-23-192605-png.1666/
https://csharpforums.net/attachments/screenshot-2021-08-23-192803-png.1667/
https://csharpforums.net/attachments/screenshot-2021-08-23-192257-png.1665/
These are 2 errors that I’m having and I don’t understand them at all:

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