I get this note “Call Not Sent” when using the below code in android

Intent callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse(callingNumber));
startActivity(callIntent);
why am I getting this note? While I won’t get this note when I change Intent.ACTION_CALL to Intent.ACTION_DIAL which goes to dialpad.
Notice:
Uri.parse("tel:" + callingNumber)