[SM5] Material.usf(1266,5):Error X3004:undeclared identifier'HeightMap'?

Development Rendering
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1

Hi I’m now do some FX excersise ,there is a Torch effect in UDK , i want to redo it in unreal engine 4,but when i create a material function called"gradient mapping",i found there is a error warning:
[SM5] Material.usf(1266,5):Error X3004:undeclared identifier’HeightMap’,

i searched google ,but i have not get a solution,any one can help me ?
with my appreciate

2

Your custom node input is named HeightMap, while apparently in the code, you have Heightmap. It is case-sensitive.

3

MaterialEditorStats: Error: [SM5] /Engine/Generated/Material.ush(1410,8-25): error X3004: undeclared identifier ‘View_ExposureScale’
MaterialEditorStats: Error: [SM5] /Engine/Generated/Material.ush(1410,1-26): error X3080: ‘CustomExpression0’: function must return a value