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Error with NormalMapFilter


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I am new to Pixi.js. I have tried to recreate the examples to learn this.

But i have an error when i try to recreate the normalMapFilter example. 


I have no problem when i use the same version of the demo (1.4)


But in my project i use the latest version (2.2.3) and then i have errors.


I get a lot of warnings and a blank canvas.

Errors look like this

pixi.dev.js:5829 Could not initialise shaderspixi.dev.js:5928 WebGL: INVALID_OPERATION: useProgram: program not validpixi.dev.js:5931 WebGL: INVALID_OPERATION: getUniformLocation: program not linked

I have correctly included the files

<script src="js/pixi.dev.js"></script><script src="js/vendor/pixi/filters/NormalMapFilter.js"></script>

And i use the same code of the demo

$(document).ready(function() { 		var viewWidth =  1920;	var viewHeight = 1080;	var renderer = PIXI.autoDetectRenderer(viewWidth, viewHeight);	$(renderer.view).addClass('pixi').appendTo('body');	var stage = new PIXI.Stage(0xFFFFFF); 	var texture = PIXI.Texture.fromImage("img/texture_norm.jpg");		var filter = new PIXI.NormalMapFilter(texture);	var sprite = PIXI.Sprite.fromImage("img/texture.jpg");	sprite.filters = [filter];		stage.addChild(sprite);	requestAnimationFrame(animate);		function animate() 	{				var mouse = stage.interactionManager.mouse;		if( mouse.global.x < 0) mouse.global.x = 0;		else if( mouse.global.x > viewWidth) mouse.global.x = viewWidth;		if( mouse.global.y < 0) mouse.global.y = 0;		else if( mouse.global.y > viewHeight) mouse.global.y = viewHeight;		filter.uniforms.LightPos.value[0] = mouse.global.x;		filter.uniforms.LightPos.value[1] = mouse.global.y;	    renderer.render(stage);	    	    requestAnimationFrame( animate );	}});	

Am i missing something ?

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