Processing + Teensy 4.0 - Serial, reprogramming issue.

[BambooSam]

Please forgive me if this is an obvious issue that I should understand by now considering I have been working with teensy and arduino since teensy 2 came out.

I am designing a led project around Teensy 4.0 which includes a bunch of led strips. I have cats, and they love to chase those moving lights! lol
So I have created a virtual led visualizer in Processing that basically grabs the frames via serial, and it works great. Only issue is in order to reprogram the Teensy 4.0 I need to close the processing application down which is really irritating and slows down the development process.

This is the error I get when I try to reprogram the sketch onto Teensy 4 while Processing app visualizer is running (Which is receiving and sending serial)
"Unable to open /dev/cu.usbmodem67022801 for reboot request
Teensy did not respond to a USB-based request to enter program mode.
Please press the PROGRAM MODE BUTTON on your Teensy to upload your sketch.
An error occurred while uploading the sketch"

I know this is an issue from using the native serial ports on Teensy. Is there a simple solution around this"? Preferably bot having to use another microcontroller as a serial bridge?

[HallMark]

Teensy4 has multiple Serial, You may use another Serial say Serial1 for your App visualizer and use Native USB Serial interface for programming purpose.