DSI visited Sir Benjie Dalicun to investigate further the cause of the error. Sir Benjie were able to make it work by extracting the nupkg file and manually calling the extracted DLL file on the source code. Apparently, the nupkg file cannot be detected by Microsoft Visual Studio 2019 and giving an error\n\nObject reference not set to an instance of an object\n\nThis is a common error for Microsoft Visual Studio Code and DSI found some fixes online that might be of help.\n\nhttps://docs.microsoft.com/en-us/answers/questions/126187/microsoft-visual-studio-object-reference-not-set-t.html\nhttps://appuals.com/object-reference-not-set-to-an-instance-of-an-object-microsoft-visual-studio/?fbclid=IwAR3B_HtgEysCJwZpJ3FlHxA9wv0TXUBgmNQI8HougId6nRhTJ1l7JLEt7N8\n