ISR(WDT_vect) expected constructor, destructor, or type conversion before '('

I saw posts in this forum regarding the same issue. Tried following the suggestions but to no avail. I have attached the entire code. Please help me with it.

GPRS_Monitor.ino (49.1 KB)

Add this to the top of your sketch…

#include <Arduino.h>

Thank you so very much. It worked!!! :slight_smile:

You are welcome.