Arduino 1.8.12 serial error

Hi Guys

I ''ve been playing with arduino for a while now and today updated to 1.8.12 from 1.8.10.

I uploaded my scetch and it gave me an error:

exit status 1
'Serial1' was not declared in this scope

I stipped the program completely and stil get the error, But when I return to 1.8.10 It compiles fine.

Seems like Serial1 is no longer used ?

The stripped down code:

void setup() {
  Serial.begin(9600);             //This turns on serial monitor on the USB

void loop() {
      Serial.println(" Hallo   ");



Any Ideas?

Could you take a few moments to Learn How To Use The Forum.
Other general help and troubleshooting advice can be found here.
It will help you get the best out of the forum in the future.

you have Uno selected


I thought I was contributing to the topic I put the reply in, but now it seems I was just stupid enough to not notice the board had changed through the update,,

Sorry for the inconvenience.

This one can be closed