problem compiling for UNO using online editor

Hi (re posting as my last post seemed to vanish?)

Using the online editor I am having issues verifying any program for the UNO board.
I have tried using "blink" unchanged from the example library, it works fine with the "Arduino/Genuino 101" board selected, but when I select the UNO from the board menu i get the following error:

Linking everything together...

lto1: fatal error: bytecode stream in file '/tmp/014847833/build/../../core/core_arduino_avr_uno_0fd389f0184d5a21fcc443ff311da7f1.a' generated with LTO version 4.1 instead of the expected 6.0

compilation terminated.

lto-wrapper: fatal error: /home/builder/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino5/bin/avr-gcc returned 1 exit status

compilation terminated.

/home/builder/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino5/bin/../lib/gcc/avr/7.3.0/../../../../avr/bin/ld: error: lto-wrapper failed

collect2: error: ld returned 1 exit status

exit status 1

Hi (re posting as my last post seemed to vanish?)

It was moved to the Online Editor section of the forum