Question Invalid subscript "shadowCoord"

Hello,

I'm having an error when I click on my shader. I just downloaded the Toon Shader from the Unity community project. It was working perfectly inside the editor but, when compiling to a WebGL, some things are lacking (no outline, colors not right, etc ..). I checked on the graph and now an error is showing :

Code (CSharp):

1. invalid subscript 'shadowCoord'
2. Compiling Vertex program with _MAIN_LIGHT_SHADOWS _SHADOWS_SOFT _ADDITIONAL_LIGHT_SHADOWS
3. 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 UNITY_LIGHTMAP_FULL_HDR
4. Disabled keywords: _MAIN_LIGHT_SHADOWS_CASCADE LIGHTMAP_ON INSTANCING_ON UNITY_NO_DXT5nm UNITY_ENABLE_NATIVE_SHADOW_LOOKUPS UNITY_METAL_SHADOWS_USE_POINT_FILTERING UNITY_NO_SCREENSPACE_SHADOWS UNITY_PBS_USE_BRDF2 UNITY_PBS_USE_BRDF3 UNITY_NO_FULL_STANDARD_SHADER UNITY_HARDWARE_TIER1 UNITY_HARDWARE_TIER2 UNITY_HARDWARE_TIER3 UNITY_COLORSPACE_GAMMA UNITY_HALF_PRECISION_FRAGMENT_SHADER_REGISTERS UNITY_LIGHTMAP_DLDR_ENCODING UNITY_LIGHTMAP_RGBM_ENCODING UNITY_VIRTUAL_TEXTURING UNITY_PRETRANSFORM_TO_DISPLAY_ORIENTATION UNITY_ASTC_NORMALMAP_ENCODING SHADER_API_GLES30

Can anyone help ?