Auto Discovery job troubleshooting

[Azartash]

Hi,

I've created an Auto-Discovery job and installed all the requierd plugins with following online instructions but no matter what plugin i choose, it creates the job but stuck there and doesn't execute it because the "Last execution" field stays empty. I
couldn't find any document about troubleshooting this problem and find the reason! does anyone knows somthing about it?

thanks.