Question WG "Hey!" Message Removal

Greetings, all.
This is my very first post! I apologize in advance for any improper etiquette.
Anyway, this is a pretty simple question. I'm using WorldGuard and created a region named "spawn" which I have set the flags for. There's one thing I want to change, though—every time a default player tries to destroy a block, it says "Hey! Sorry, but you can't break that block here."
To be clear, it's just the message I don't like; they shouldn't be able to edit terrain.
I guess my question is, is it possible to remove this message people get when they attempt to build?
I've gone through the WG config and flags... nothing seems to be amiss.
Below are the flags I've set for the region, as well as a screenshot.
REGION FLAGS: (I'm not sure these are the problem, posting them just to be safe)
regions:
spawn:
min: {x: -48.0, y: 0.0, z: -48.0}
flags:
exp-drops: deny
pistons: allow
vehicle-destroy: deny
mushroom-growth: allow
use: allow
snow-melt: allow
fire-spread: deny
lighter: deny
mob-spawning: deny
lava-fire: deny
spawn: {yaw: -180.74594, pitch: 34.199955, z: -0.5, y: 52.0, world: pvp,
x: 0.5}
lava-flow: deny
farewell: §b&oLooks like you've somehow left the arena. Type /spawn to return.
chest-access: deny
enderman-grief: deny
ice-melt: allow
entity-item-frame-destroy: deny
mycelium-spread: allow
entity-painting-destroy: deny
other-explosion: allow
grass-growth: allow
ghast-fireball: allow
soil-dry: allow
vehicle-place: allow
pvp: allow
leaf-decay: deny
invincible: deny
water-flow: deny
enderdragon-block-damage: deny
sleep: allow
ice-form: allow
creeper-explosion: allow
vine-growth: deny
lightning: allow
tnt: allow
enderpearl: allow
mob-damage: allow
snow-fall: allow
max: {x: 48.0, y: 255.0, z: 48.0}
priority: 0
type: cuboid
owners: {}
members: {}

Here's a screenie.

Thanks for any help.

 

Thank you!