Arduino advice

I want to send data via NRF24 module tranciever. At the moment I am only able to send a text like " ABC123" , but I need to send elapsed time from a variable. My code. I want to send to my receiver the value of the message2 variable, but I am getting error " initializer fails to determine size of 'data' Who can help me. //*********Send message to server after distance sense***************** [login to view URL]("Sending to nrf24_server"); // Send a message to nrf24_server char message[10]; int i; // long val = 1234567; long val=elapsed; [login to view URL]("The value is: "); // Show the integer number [login to view URL](val); ltoa(val, message, 10); [login to view URL]("As a string: "); for (i = 0; i < strlen(message); i++) { [login to view URL](message[i]); // Show as a string message2=message2 + message[i]; } delay(5000); ; // uint8_t data[] = "ABC123,CHECK123456789"; // This works, I am able to send this uint8_t data[] = message2[1]; //This doesn't work . I got the error initializer fails to determine size of 'data' . [login to view URL](data, sizeof(data)); [login to view URL](); // Now wait for a reply uint8_t buf[RH_NRF24_MAX_MESSAGE_LEN]; uint8_t len = sizeof(buf); status=1; break; //*****************************************