Thanks for your reply. All of the required libraries are included.
I start out with a working USB UART application and then slowly add in my code, while testing along the way. After a while the compiler starts complaining. Sometimes it is intermittent and sometimes it fails repeatedly. If I hover over USBUART_MAX_EP , the IDE shows the value, so it can find it. If I hard code the value at the problem statement, the error just moves to another similar error else where in the USBUART API.
One time, as a clean and build was running, I saw that the USB pins were reassigned (to the same ones I had assigned) and it compiled. I changed my my USB pins to "auto assign" and unchecked "lock". It now seems to regularly compile without any changes to the firmware???
I am not sure what is going on, but at least I was able to complete my firmware. I still have another test program that was not fixed by that trick, so it is not a magic bullet.