Blynk_firmware_type was not declared in this scope

Permission to ask How to solve the error ? Thank u
'BLYNK_FIRMWARE_TYPE' was not declared in this scope

This is the link for code
https://drive.google.com/file/d/1tvB63v_KQXO3oS99iOVqub7hdzTyoPCd/view?usp=sharing

Hello, do yourself a favour and please read How to get the best out of this forum and modify your post accordingly (including code tags and necessary documentation for your ask).

okay sir

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