error compiling RFM12B send/receive example

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3 
#if defined(RF69_COMPAT)
  volatile uint8_t* Data;
  volatile uint8_t* DataLen;
#endif

If the RF69_COMPAT value is defined, Data and DataLen are created as private members of the class.

#if !defined(RF69_COMPAT) //don't hold the same values in COMPAT mode, so use the accessor functions
    volatile uint8_t* Data;
    volatile uint8_t* DataLen;
#endif

Otherwise, they are defined as public members of the class.

#define RF69_COMPAT 1

By default, the data is private.

Therefore, this:

     [b] for (byte i = 0; i < *radio.DataLen; i++) //can also use radio.GetDataLen() if you don't like pointers[/b]
        Serial.print((char)radio.Data[i]);

will not work, and you'll have to use the GetDataLen() and GetData() methods.

By the way, don't try to bold stuff in a code window.