My Macbook Pro won't sleep when connected to AC

When I look at pmset -g i get this:

 

pmset -g

Active Profiles:

Battery Power                    1

AC Power                    2*

Currently in use:

standbydelay         4200

standby              0

womp                 1

halfdim              1

hibernatefile        /var/vm/sleepimage

sms                  1

networkoversleep     0

disksleep            10

sleep                10 (sleep prevented by )

hibernatemode        3

ttyskeepawake        1

displaysleep         10

acwake               0

lidwake              1

 

I haven't seen any other discussions with "sleep   10 (sleep prevented by )".

 

Any help with how to remove (sleep prevented by ), Thanks!!

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