I got this material compilation error

I bought a PostProcessing material from Unreal Engine marketplace and added to my UE5 and then Imported it UEFN… But whenever I try to compile my material in UEFN, I get this error… I though this error was no big deal until I noticed that, whenever I use this material in UEFN, my game crashes or doesn’t load during play test. I would really appreciate it if somebody tells me how to fix this error :frowning:
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