Unable to build due to shader error "Output variable vert contains a system-interpreted value"

Hello all,

I've been struggling to build my project due to an error. I've searched everywhere and cannot find the solution. I don't know enough about Shaders to fix this myself.

The error is as follows:

Shader error in 'Hidden/Image Effects/Cinematic/Bloom': Output variable vert contains a system-interpreted value (SV_RenderTargetArrayIndex) which must be written in every execution path of the shader. Unconditional initialization may help. at Assets/AssetPacks/NatureStarterKit/Standard Assets/Effects/CinematicEffects(BETA)/Bloom/Resources/Bloom.cginc(129) (on d3d11)

Compiling Vertex program with STEREO_INSTANCING_ON
Platform defines: UNITY_ENABLE_REFLECTION_BUFFERS UNITY_USE_DITHER_MASK_FOR_ALPHABLENDED_SHADOWS UNITY_PBS_USE_BRDF1 UNITY_SPECCUBE_BOX_PROJECTION UNITY_SPECCUBE_BLENDING UNITY_ENABLE_DETAIL_NORMALMAP SHADER_API_DESKTOP UNITY_LIGHT_PROBE_PROXY_VOLUME


The Shader code is:
#include "UnityCG.cginc"

// Mobile: use RGBM instead of float/half RGB
#define USE_RGBM defined(SHADER_API_MOBILE)

sampler2D _MainTex;
sampler2D _BaseTex;
float2 _MainTex_TexelSize;
float2 _BaseTex_TexelSize;
half4 _MainTex_ST;
half4 _BaseTex_ST;

float _PrefilterOffs;
half _Threshold;
half3 _Curve;
float _SampleScale;
half _Intensity;

// Brightness function
half Brightness(half3 c)
{
return max(max(c.r, c.g), c.b);
}

// 3-tap median filter
half3 Median(half3 a, half3 b, half3 c)
{
return a + b + c - min(min(a, b), c) - max(max(a, b), c);
}

// Clamp HDR value within a safe range
half3 SafeHDR(half3 c) { return min(c, 65000); }
half4 SafeHDR(half4 c) { return min(c, 65000); }

// RGBM encoding/decoding
half4 EncodeHDR(float3 rgb)
{
#if USE_RGBM
rgb *= 1.0 / 8;
float m = max(max(rgb.r, rgb.g), max(rgb.b, 1e-6));
m = ceil(m * 255) / 255;
return half4(rgb / m, m);
#else
return half4(rgb, 0);
#endif
}

float3 DecodeHDR(half4 rgba)
{
#if USE_RGBM
return rgba.rgb * rgba.a * 8;
#else
return rgba.rgb;
#endif
}

// Downsample with a 4x4 box filter
half3 DownsampleFilter(float2 uv)
{
float4 d = _MainTex_TexelSize.xyxy * float4(-1, -1, +1, +1);

half3 s;
s = DecodeHDR(tex2D(_MainTex, uv + d.xy));
s += DecodeHDR(tex2D(_MainTex, uv + d.zy));
s += DecodeHDR(tex2D(_MainTex, uv + d.xw));
s += DecodeHDR(tex2D(_MainTex, uv + d.zw));

return s * (1.0 / 4);
}

// Downsample with a 4x4 box filter + anti-flicker filter
half3 DownsampleAntiFlickerFilter(float2 uv)
{
float4 d = _MainTex_TexelSize.xyxy * float4(-1, -1, +1, +1);

half3 s1 = DecodeHDR(tex2D(_MainTex, uv + d.xy));
half3 s2 = DecodeHDR(tex2D(_MainTex, uv + d.zy));
half3 s3 = DecodeHDR(tex2D(_MainTex, uv + d.xw));
half3 s4 = DecodeHDR(tex2D(_MainTex, uv + d.zw));

// Karis's luma weighted average (using brightness instead of luma)
half s1w = 1 / (Brightness(s1) + 1);
half s2w = 1 / (Brightness(s2) + 1);
half s3w = 1 / (Brightness(s3) + 1);
half s4w = 1 / (Brightness(s4) + 1);
half one_div_wsum = 1 / (s1w + s2w + s3w + s4w);

return (s1 * s1w + s2 * s2w + s3 * s3w + s4 * s4w) * one_div_wsum;
}

half3 UpsampleFilter(float2 uv)
{
#if HIGH_QUALITY
// 9-tap bilinear upsampler (tent filter)
float4 d = _MainTex_TexelSize.xyxy * float4(1, 1, -1, 0) * _SampleScale;

half3 s;
s = DecodeHDR(tex2D(_MainTex, uv - d.xy));
s += DecodeHDR(tex2D(_MainTex, uv - d.wy)) * 2;
s += DecodeHDR(tex2D(_MainTex, uv - d.zy));

s += DecodeHDR(tex2D(_MainTex, uv + d.zw)) * 2;
s += DecodeHDR(tex2D(_MainTex, uv )) * 4;
s += DecodeHDR(tex2D(_MainTex, uv + d.xw)) * 2;

s += DecodeHDR(tex2D(_MainTex, uv + d.zy));
s += DecodeHDR(tex2D(_MainTex, uv + d.wy)) * 2;
s += DecodeHDR(tex2D(_MainTex, uv + d.xy));

return s * (1.0 / 16);
#else
// 4-tap bilinear upsampler
float4 d = _MainTex_TexelSize.xyxy * float4(-1, -1, +1, +1) * (_SampleScale * 0.5);

half3 s;
s = DecodeHDR(tex2D(_MainTex, uv + d.xy));
s += DecodeHDR(tex2D(_MainTex, uv + d.zy));
s += DecodeHDR(tex2D(_MainTex, uv + d.xw));
s += DecodeHDR(tex2D(_MainTex, uv + d.zw));

return s * (1.0 / 4);
#endif
}

//
// Vertex shader
//

v2f_img vert(appdata_img v)
{
v2f_img o;
#if UNITY_VERSION >= 540
o.SV_RenderTargetArrayIndex = 1;
o.pos = UnityObjectToClipPos(v.vertex);
o.uv = UnityStereoScreenSpaceUVAdjust(v.texcoord, _MainTex_ST);
#else
o.pos = UnityObjectToClipPos(v.vertex);
o.uv = v.texcoord;
#endif
return o;
}

struct v2f_multitex
{
float4 pos : SV_POSITION;
float2 uvMain : TEXCOORD0;
float2 uvBase : TEXCOORD1;
};

v2f_multitex vert_multitex(appdata_img v)
{
v2f_multitex o;
#if UNITY_VERSION >= 540
o.pos = UnityObjectToClipPos(v.vertex);
o.uvMain = UnityStereoScreenSpaceUVAdjust(v.texcoord, _MainTex_ST);
o.uvBase = UnityStereoScreenSpaceUVAdjust(v.texcoord, _BaseTex_ST);
#else
o.pos = UnityObjectToClipPos(v.vertex);
o.uvMain = v.texcoord;
o.uvBase = v.texcoord;
#endif
#if UNITY_UV_STARTS_AT_TOP
if (_BaseTex_TexelSize.y < 0.0)
o.uvBase.y = 1.0 - v.texcoord.y;
#endif
return o;
}

//
// fragment shader
//

half4 frag_prefilter(v2f_img i) : SV_Target
{
float2 uv = i.uv + _MainTex_TexelSize.xy * _PrefilterOffs;

#if ANTI_FLICKER
float3 d = _MainTex_TexelSize.xyx * float3(1, 1, 0);
half4 s0 = SafeHDR(tex2D(_MainTex, uv));
half3 s1 = SafeHDR(tex2D(_MainTex, uv - d.xz).rgb);
half3 s2 = SafeHDR(tex2D(_MainTex, uv + d.xz).rgb);
half3 s3 = SafeHDR(tex2D(_MainTex, uv - d.zy).rgb);
half3 s4 = SafeHDR(tex2D(_MainTex, uv + d.zy).rgb);
half3 m = Median(Median(s0.rgb, s1, s2), s3, s4);
#else
half4 s0 = SafeHDR(tex2D(_MainTex, uv));
half3 m = s0.rgb;
#endif

#if UNITY_COLORSPACE_GAMMA
m = GammaToLinearSpace(m);
#endif
// Pixel brightness
half br = Brightness(m);

// Under-threshold part: quadratic curve
half rq = clamp(br - _Curve.x, 0, _Curve.y);
rq = _Curve.z * rq * rq;

// Combine and apply the brightness response curve.
m *= max(rq, br - _Threshold) / max(br, 1e-5);

return EncodeHDR(m);
}

half4 frag_downsample1(v2f_img i) : SV_Target
{
#if ANTI_FLICKER
return EncodeHDR(DownsampleAntiFlickerFilter(i.uv));
#else
return EncodeHDR(DownsampleFilter(i.uv));
#endif
}

half4 frag_downsample2(v2f_img i) : SV_Target
{
return EncodeHDR(DownsampleFilter(i.uv));
}

half4 frag_upsample(v2f_multitex i) : SV_Target
{
half3 base = DecodeHDR(tex2D(_BaseTex, i.uvBase));
half3 blur = UpsampleFilter(i.uvMain);
return EncodeHDR(base + blur);
}

half4 frag_upsample_final(v2f_multitex i) : SV_Target
{
half4 base = tex2D(_BaseTex, i.uvBase);
half3 blur = UpsampleFilter(i.uvMain);
#if UNITY_COLORSPACE_GAMMA
base.rgb = GammaToLinearSpace(base.rgb);
#endif
half3 cout = base.rgb + blur * _Intensity;
#if UNITY_COLORSPACE_GAMMA
cout = LinearToGammaSpace(cout);
#endif
return half4(cout, base.a);
}