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EZDSP 5535 - uart on demo project (c55)

I am working on a ezdsp5535. I am trying to add communication using UART in the c55 demo project. When I run the demo without uart, it runs without issues, but when I run the code, the task hangs on EZDSP5535_UART_open(). 

Is it possible to use the USBAudioClass at the same time as UART, and if so, how?

I also have an error when launching the debugger:

Error connecting to the target:
(Error -1143 @ 0x5F)
Device memory bus has an error and may be hung. Verify that the memory address is in valid memory. If error persists, confirm configuration, power-cycle board, and/or try more reliable JTAG settings (e.g. lower TCLK).
(Release 5.0.429.0)

Thank you for your help!