This was working before. The project is Pewma, that is already published. I was trying to make a few changes.
<!--sounds-->
<assets path="assets/sounds" if="flash" >
<sound path="Explosion.mp3" id="Explosion" />
<sound path="Powerup.mp3" id="Chimango" />
<sound path="Jump_1.mp3" id="Jump_1" />
<sound path="Jump_2.mp3" id="Jump_2" />
<sound path="Jump_3.mp3" id="Jump_3" />
<sound path="Jump_4.mp3" id="Jump_4" />
<sound path="fall.mp3" id="fall" />
<sound path="Rebote_1.mp3" id="rebote1" />
<sound path="Rebote_2.mp3" id="rebote2" />
<sound path="Rebote_3.mp3" id="rebote3" />
<sound path="fuego_1.mp3" id="powerup1" />
<sound path="fuego_2.mp3" id="powerup2" />
<sound path="fuego_3.mp3" id="powerup3" />
<sound path="PEWMA_Intro.mp3" id="intro" />
<sound path="Rayo_1.mp3" id="rayo1" />
<sound path="Rayo_2.mp3" id="rayo2" />
<sound path="Rayo_3.mp3" id="rayo3" />
<sound path="Viento_1.mp3" id="viento1" />
<sound path="Viento_2.mp3" id="viento2" />
<sound path="Explota_Globo.mp3" id="explota_globo1" />
<sound path="Explota_Globo_2.mp3" id="explota_globo2" />
<sound path="Explota_Globo_3.mp3" id="explota_globo3" />
<sound path="Cannon_1.mp3" id="cannon1" />
<sound path="Cannon_2.mp3" id="cannon2" />
<sound path="Cannon_3.mp3" id="cannon3" />
<sound path="Cannon_4.mp3" id="cannon4" />
<sound path="Colision_DP.mp3" id="Colision_DispPajaro" />
<sound path="Powerup_Acheived.mp3" id="Powerup_Acheived" />
<sound path="Powerup_Used.mp3" id="Powerup_Used" />
<sound path="Loading_Cannon_1.mp3" id="loadCannon1" />
<sound path="Loading_Cannon_2.mp3" id="loadCannon2" />
<sound path="Loading_Cannon_3.mp3" id="loadCannon3" />
</assets>
<assets path="assets/sounds" unless="flash" >
<sound path="Explosion.ogg" id="Explosion" />
<sound path="Powerup.ogg" id="Chimango" />
<sound path="Jump_1.ogg" id="Jump_1" />
<sound path="Jump_2.ogg" id="Jump_2" />
<sound path="Jump_3.ogg" id="Jump_3" />
<sound path="Jump_4.ogg" id="Jump_4" />
<sound path="fall.ogg" id="fall" />
<sound path="Rebote_1.ogg" id="rebote1" />
<sound path="Rebote_2.ogg" id="rebote2" />
<sound path="Rebote_3.ogg" id="rebote3" />
<sound path="fuego_1.ogg" id="powerup1" />
<sound path="fuego_2.ogg" id="powerup2" />
<sound path="fuego_3.ogg" id="powerup3" />
<sound path="PEWMA_Intro.ogg" id="intro" />
<sound path="Rayo_1.ogg" id="rayo1" />
<sound path="Rayo_2.ogg" id="rayo2" />
<sound path="Rayo_3.ogg" id="rayo3" />
<sound path="Viento_1.ogg" id="viento1" />
<sound path="Viento_2.ogg" id="viento2" />
<sound path="Explota_Globo.ogg" id="explota_globo1" />
<sound path="Explota_Globo_2.ogg" id="explota_globo2" />
<sound path="Explota_Globo_3.ogg" id="explota_globo3" />
<sound path="Cannon_1.ogg" id="cannon1" />
<sound path="Cannon_2.ogg" id="cannon2" />
<sound path="Cannon_3.ogg" id="cannon3" />
<sound path="Cannon_4.ogg" id="cannon4" />
<sound path="Colision_DP.ogg" id="Colision_DispPajaro" />
<sound path="Powerup_Acheived.ogg" id="Powerup_Acheived" />
<sound path="Powerup_Used.ogg" id="Powerup_Used" />
<sound path="Loading_Cannon_1.ogg" id="loadCannon1" />
<sound path="Loading_Cannon_2.ogg" id="loadCannon2" />
<sound path="Loading_Cannon_3.ogg" id="loadCannon3" />
</assets>
<!--music-->
<assets path="assets/music" if="flash" >
<music path="indiecitos.mp3" id="Music" />
</assets>
<assets path="assets/music" unless="flash" >
<music path="indiecitos.ogg" id="Music" />
</assets>
C:\Users\Agustin>haxelib list
actuate: 1.7.2 1.7.3 1.7.5 1.8.0 1.8.1 1.8.2 [1.8.6]
admob: git [dev:C:\HaxeToolkit\haxe\lib/admob/git]
asiads: git [dev:C:\HaxeToolkit\haxe\lib/asiads/git]
dragonbones: git [dev:C:\HaxeToolkit\haxe\lib/dragonbones/git]
firetongue: git [dev:C:\HaxeToolkit\haxe\lib/firetongue/git]
flixel-addons: 1.0.3 [1.1.0]
flixel-demos: 1.0.2 1.1.0 1.1.1 [1.1.2]
flixel-templates: 1.0.0 1.0.1 [1.0.2]
flixel-tools: 1.0.2 1.0.3 1.0.4 1.0.5 [1.1.0]
flixel-ui: 1.0.1 [1.0.2]
flixel: 3.2.2 3.3.0 3.3.1 3.3.10 [3.3.11] 3.3.3 3.3.4 3.3.5 3.3.6 3.3.8
haxelib_client: 3.1.0-rc.3 3.1.0-rc.4 [3.2.0-rc.3]
hxcpp: 3.0.2 3.1.21 3.1.22 3.1.30 3.1.37 3.1.39 3.1.48 3.1.68 [3.2.102]
hxlibc: [1.1.4]
hyprate: git [dev:C:\HaxeToolkit\haxe\lib/hyprate/git]
iap: 1.0.4 1.0.5 [1.0.6]
inthebox-macros: git [dev:C:\HaxeToolkit\haxe\lib/inthebox-macros/git]
lime-tools: 1.3.0 1.3.1 1.3.2 1.4.0 1.5.4 1.5.6 [1.5.7]
lime: 0.9.5 0.9.6 0.9.7 1.0.0 1.0.1 2.0.0 2.0.4 2.0.5 2.0.6 2.1.1 2.4.3 2.4.7 [2.5.2]
nape: 2.0.15 2.0.16 2.0.17 [2.0.19]
openfl-bitfive: git [dev:c:\haxetoolkit\haxe\lib/openfl-bitfive/git]
openfl-html5-dom: 1.2.1 [1.2.2]
openfl-html5: [1.0.5] 1.1.0-beta 1.1.1-beta 1.4.0-beta 1.4.1-beta 1.4.2-beta
openfl-native: 1.2.4 1.3.0 [1.4.0]
openfl-samples: 1.2.1 1.3.0 2.1.0 2.2.0 2.2.1 2.2.2 [3.1.0]
openfl: 1.2.3 1.3.0 1.4.0 2.0.0 2.0.1 2.1.6 2.2.1 2.2.3 2.2.4 2.2.6 2.2.7 3.0.8
3.1.1 [3.2.2]
spinehx: [0.2.0]
SpriterHaxeEngine: 1.1.0 1.3.1 [1.5.0]
swf: 1.4.1 1.4.2 1.5.2 1.7.0 1.7.3 1.7.5 1.7.6 1.7.7 1.8.7 1.8.9 [1.9.1]
task: [1.0.6]
tilelayer: [0.2.0]