In a3\data_f\ParticleEffects\config.cpp, line 29616 (ArmA 3 v1.54 stable), "type" is specified as "GrenadeExp1" (class RocketExplosion -> class GrenadeExp1). However, there is no "class GrenadeExp1" in CfgCloudlets or CfgLights, onyl "class GrenadeExp".
Other classes like class IEDMineSmallExplosion -> class GrenadeExp1 use the correct "type = "GrenadeExp";", which is defined in CfgCloudlets.
class RocketExplosion
{
class LightExp
{
simulation = "light";
type = "ExploLightMed";
position[] = {0,0,0};
intensity = 0.001;
interval = 1;
lifeTime = 0.5;};
class GrenadeExp1
{
simulation = "particles";
type = "GrenadeExp1"; //<-------should be "GrenadeExp"
position[] = {0,0,0};
intensity = 1;
interval = 1;
lifeTime = 0.5;};
class SmallSmoke1
{
simulation = "particles";
type = "SmallSmokeFast1";
position[] = {0,0,0};
intensity = 1;
interval = 1;
lifeTime = 1;};
};