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The solution is actually simple, or it was in my case. I reinstalled Raspian from a fresh download and followed the instructions exactly as above. It worked perfectly after that. I had used my RPi for another project before this one, and I believe some of the dependencies and libraries were conflicting with one another preventing the capture and processing of the signals. Hope this helps!
I fixed the issue, but it was by starting over from scratch. I installed a fresh Raspian image onto the SD card and followed the instructions again step by step, and it works flawlessly. I think other libraries/software I had installed previously was interfering with the software needed for this project.
Raspberry Pi 3 B+ and V-dipole antenna!
Ignore this. I found a few of my issues. Hoping for good results on the next pass!
Were you able to solve this issue? I've tried adding the user to sudoers with no success. I'm still getting the same error message with every satellite pass.