NMM got me to update the masterlist. I did that. I tried running BOSS afterwards to see if there had been any mod ordering changes. Now when I start it up, it loops infinitely with this error. BOSS does not run as intended due to this.

The Error is as follows.

Weightless ,1.23; ores 1.32 \ .esp is not a valid regular expression item skipped, not a regular valid expression item skipped.

This loops forever. At first I thought it might of been due to one of the new mods I had installed but I ran the game fine before this. It was only after the NMM masterlist update and I ran BOSS again that it occurs.

Pretty sure it doesn't download anything.

Yea same here Bounce. Pretty sure I've said yes to download the master list, then gone to boss and it has also downloaded the master list.