How to connect to sharepoint folder using power query?

Got an error Unable to connect

Details: “Microsoft.Mashup.Engine1.Library.Resources.HttpResource: Request failed:
OData Version: 3 and 4, Error: The remote server returned an error: (500) Internal Server Error. (500 INTERNAL SERVER ERROR)
OData Version: 4, Error: The remote server returned an error: (500) Internal Server Error. (500 INTERNAL SERVER ERROR)
OData Version: 3, Error: The remote server returned an error: (500) Internal Server Error. (500 INTERNAL SERVER ERROR)”