Thank you @Daan, it helped untangle the script. Ctrl+L did it, downloading missing package removed the red node. However, funny thing happened to all groups (they are gone) and all Code Block objects.
The hunt is still on 
Thank you @Daan, it helped untangle the script. Ctrl+L did it, downloading missing package removed the red node. However, funny thing happened to all groups (they are gone) and all Code Block objects.
The hunt is still on