open AutoModels.tt file，change the database value first:

var @namespace = "Kooboo.CMS.Toolkit";
var database = "SampleSite";//change this with your site database name
ar schemaDir = .....

Then Right click the file ,Select "Run Custom Tool".

If you get an Schema path error, just close the project,then restart the project ,
or set the schemaDir with an absolute path.