Sorry, I meant '$cd /Library/Extensions'.. It looks like it is properly installed on your system.Thank you so much for your help. When typed the commands into the terminal the Apple FTDI driver and Apple's generic USB serial driver showed up, but when I typed in
$ cd /Library
$ ls | grep USB
I did not get any output in the terminal but I just searched in finder under library and then extensions and I attached a picture below and FTDIUSBSerialDriver.kext was listed in the extension folder. I also opened the system information application and under extensions, I found the .kexts listed and only have 1 FTDIUSBSerialDriver.kext, which is good.
Looking at the image you attached shows at least one of the problems.. It's reporting compiler errors, not a driver problem.I was thinking a bit more and I am wondering if the driver is not the issue.