Connection to RexQualis stopped working

A year ago, when I was first into arduino/arduino coding, I was using the web editor on my chromebook and successfully uploading via USB to my RexQualis UNO R3 board. Now that I've got time again, I'm trying but even with updating to the Create app for the chrome extension, I can upload on the board "Arduino Mega2560" and it appears successful but then I get an orange bar in the IDE that reads "[object object]"
Here is the upload log.

/usr/local/bin/arduino-cli compile --fqbn arduino:avr:mega:cpu=atmega2560 --libraries /home/builder/opt/libraries/latest --build-cache-path /tmp --output-dir /tmp/653112230/build --build-path /tmp/arduino-build-2A30FCE86E18AE848EFEE40ACDD4A019 --library /mnt/create-efs/webide/b9/2e/b92e62acb9d29040e0e9545a69008324:chrishuff/libraries_v2/Arduino Helpers --library /mnt/create-efs/webide/b9/2e/b92e62acb9d29040e0e9545a69008324:chrishuff/libraries_v2/DFRobotDFPlayerMini --library /mnt/create-efs/webide/b9/2e/b92e62acb9d29040e0e9545a69008324:chrishuff/libraries_v2/Servo /tmp/653112230/Joystick

Sketch uses 4022 bytes (1%) of program storage space. Maximum is 253952 bytes.

Global variables use 216 bytes (2%) of dynamic memory, leaving 7976 bytes for local variables. Maximum is 8192 bytes.

Upload started

Programming with: avrgirl-arduino flash -f undefined -a mega -p /dev/ttyACM0

connected

reset complete.

flash complete.

Sorry to say that I find your post confusing. You're refering to both an Uno and a Mega. Is your problem with the Uno or with a Mega? Why do you compile for a Mega if you have an Uno?

Maybe this helps: the error message says [object Object] for some very strange reason - #13 by kgebhardt.
Found with arduino "[object object]" - Google Search