call of overloaded 'function' is ambigous

Projects Programming
5

Ok, I've solved it like this and it works fine.
Thanks one more time

char str[] = "AT+HTTPPARA=\"URL\",\"www.mysite.com/?parameter1=%ld/\"";
char str2[1000]; 
sprintf(str2,str,sum_num);
mySerial.println(str2);