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STM32F4 Clock Config with USB?

Question asked by erickson.troy.001 on Mar 6, 2016
Latest reply on Mar 6, 2016 by Clive One

When adding a USB CDC Device to my project using CubeMX I am getting an error in the clock configuration tab saying that the source of the clock has to be external? If USB is removed then there is no error. Attached is the image I am seeing.