One and done. Can't upload any more programs

Once setup was complete, I uploaded my first program successfully.

Now, when I try to upload a different program, I get the error message below. I am running a 2018 Mac mini with Mac OS Big Sur. Initially, the Mac was saying there was a power problem, that the device was drawing too much power. I find that hard to believe. I don’t get that message anymore, but I also can’t upload any programs. This is what the System says about the USB connection

USB 3.1 Bus:

Host Controller Driver: AppleIntelCNLUSBXHCI
PCI Device ID: 0xa36d
PCI Revision ID: 0x0010
PCI Vendor ID: 0x8086

Vendor-Specific Device:

Product ID: 0x0c9f
Vendor ID: 0x1781
Version: 1.04
Speed: Up to 1.5 Mb/s
Location ID: 0x14300000 / 2
Current Available (mA): 500
Extra Operating Current (mA): 0

I’ve tried different cables, different USB ports (USB 3.1), cycling the power switch on the Pocket AVR Programmer, rotating the serial ports, using the pogo pins.

I don’t think it’s a programmer-blink problem. Seems more like a computer to programmer problem. Nevertheless, I am a 99% novice here. Chances are it’s a really simple solution and I just don’t know what it is!

TIA

-G-

BEGIN ERROR MESSAGE

avrdude: Version 6.3-20190619
Copyright © 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright © 2007-2014 Joerg Wunsch

     System wide configuration file is "/Users/fronch/Library/Arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf"
     User configuration file is "/Users/fronch/.avrduderc"
     User configuration file does not exist or is not a regular file, skipping

     Using Port                    : usb
     Using Programmer              : stk500v2

avrdude: usbdev_open(): did not find any USB device “usb” (0x03eb:0x2104)

avrdude done. Thank you.

An error occurred while uploading the sketch.

BEGIN ERROR MESSAGE

Unless you are using a programmer that is not shipped with the dev kit intentionally, then you configured the wrong programmer. It should be USBTinyISP.