Modding Help Need help fixing this.

Im new to modding and i was trying to make a bomb that changes the surface to lava. But ingame when i throw it the bomb just disappears instead of making lava. Could anyone help me fix this?

Here is the .projectile

{
"projectileName" : "lavabomb",
"physics" : "grenade",
"bounces" : -1,
"timeToLive" : 10,
"frames" : "lavabomb.png",
"speed" : 20,
"animationCycle" : 1.5,
"lightColor" : [105, 64, 0],
"frameNumber" : 7,
"piercing" : true,
"actionOnReap" : [
{
"action" : "applySurfaceMod",
"previousMod" : null,
// "previousMod" : null,
"newMod" : "lava",
"radius" : 10
}
],
"power" : 0,
"damageType" : "NoDamage",
"damageKind" : "default",
"damagePoly" : [ [-6, 0], [-4, -4], [0, -6], [4, -4], [6, 0], [4, 4], [0, 6], [-4, 4] ],
"emitters" : [ "sparks" ]
}

 

Did you check your starbound.log for any errors?

Compare yours to the lava baloon?