Hello Steven,
I tried to replicate your issue on my side but I could successfully compile the project after initialize peripheral using Peripherals Tool. Please check my steps below. I am using SDK 2.6.1
- I created a new project.
- Enable USB device component by going to SDK management.

- Enable the USB peripheral using Peripherals Tool as follows.

- Enabled the USBPHY1_CLK by using Clock Tool.

By doing this my project compiled correctly, could you please tell me if you are following the steps above on your side as well as the SDK version you are using?
Have a great day,
Felipe
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