immediately after installation, an authentication dialog window appears

[gcomes]

I have installed from source plasmoid-ultimate-gmail-feed. After the installation, before I add the applet to the panel, an authentication window appears and is is not possible to get rid of it. I found that if I modify the source files package/metadata.desktop and package/metadata.json and I change EnabledByDefault from true to false this fix the problem. The authentication window appears only after I add the applet to the panel.