HLSL, Whats is wrong, this time...?

@Myth wrote:

Hello, I am new in HLSL, totally new. I am tring to implement the lights, but every code line is a epic battle.

Now I recive a error, if I delete the line:
if (dist <= lightRadius[i])
all work.. but I need the line. Any one know what is happening now?

//////////////////////////////////////

sampler s0;
float4 lightColor[75];
float lightRadius[75];
float2 lightCenter[75];
int lightNumber;
float2 cameraPosition;

float4 PixelShaderFunction(float4 pos : SV_POSITION, float4 color1 : COLOR0, float2 coords : TEXCOORD0) : COLOR0
{
float4 color = tex2D(s0, coords);
float4 end_color = color;
float2 screenPosition = float2(coords.x * 1920, coords.y * 1080) + cameraPosition;
float dist;

for (int i = 0; i < 75; i++)
{
    if (i == lightNumber)
    {
        break;
    }
    else
    {
        dist = distance(screenPosition, lightCenter[i]);

        if (dist <= lightRadius[i])
        {
            //end_color = end_color*lightColor[i];
        }
    }
}

return color;

}

technique Technique1
{
pass Pass1
{
PixelShader = compile ps_4_0_level_9_1 PixelShaderFunction();
}
}

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