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how to solve this error

 please help

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  • Please make the title of the thread more descriptive!

    The 'C' programming language requires that identifiers must be defined (or, at least, declared) before they can be used.

    So, if the compiler tells you that something is un-deinfed, the solution is to define it.

    Have you omitted to include a required header file?

    Have you omitted to make required settings in the sdk_config.h file?

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  • Please make the title of the thread more descriptive!

    The 'C' programming language requires that identifiers must be defined (or, at least, declared) before they can be used.

    So, if the compiler tells you that something is un-deinfed, the solution is to define it.

    Have you omitted to include a required header file?

    Have you omitted to make required settings in the sdk_config.h file?

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