Opencore Guide: "Cpuid1Data" can add value, please help.

Can someone explain to me why i'm getting the below error when trying to add the value "D4060300 00000000 00000000 00000000" to "Cpuid1Data" in section "5.2. Emulate" of my config.plist when using ProperTree ?

What invalid character ?

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https://preview.redd.it/ys5cbuzuqz451.png?width=857&format=png&auto=webp&s=4954ba697734e3d74d7bffc0fd3b9a067f972bee