If using this, you need to leave out the value
for line #4 and #5
<add key="Umbraco.ModelsBuilder.Enable" value="true" /><add key="Umbraco.ModelsBuilder.ModelsMode" value="AppData" />​<add key="Umbraco.ModelsBuilder.AcceptUnsafeModelsDirectory" value="true" /><add key="Umbraco.ModelsBuilder.ModelsDirectory" value="~/Models/Generated" />