I have error in Shader transparent/Refractive

I have no idea about that what is going on because i have not any knowledge of Shader programming

i have a error

Shader error in 'Transparent/Refractive': 'vert': output parameter 'o' not completely initialized at line 66 (on d3d9)

Compiling Vertex program with DIRECTIONAL
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_COLORSPACE_GAMMA

What should i do to fix this error?

This is the code where we found the error

			void vert (inout appdata_full v, out Input o)
			{
#if SHADER_API_D3D11
				UNITY_INITIALIZE_OUTPUT(Input, o);
#endif
				o.position = UnityObjectToClipPos(v.vertex);
				
				#if UNITY_UV_STARTS_AT_TOP
					float scale = -1.0;
				#else
					float scale = 1.0;
				#endif
				o.proj.xy = (float2(o.position.x, o.position.y * scale) + o.position.w) * 0.5;
				o.proj.zw = o.position.zw;
			}

how i fix it .

Try removing the stuff surrounding the ‘UNITY_INITIALIZE_OUTPUT (Input, o);’, i.e.

Remove;

#if SHADER_API_D3D11
//& also remove
#endif

Because there may be some compilation errors on certain platforms.