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RTOS/TM4C1294NCPDT: Only one UART index can be used at a time..

Part Number: TM4C1294NCPDT

Tool/software: TI-RTOS

the TI RTOS 2.20 user guide says of the UART driver, "...Only one UART index can be used at a time. If the index is already in use, the driver returns NULL and logs a warning.."

What does this mean?  It's not clear what it means: Read() or write() can only be called on one instance at a time?  The second sentence sounds like it's saying that an Index can only be used by one instance at a time, which is different.  I'm trying to understand what the restrictions are, as I'd like to read and write from multiple UARTs at a time (which seems like the point of having multiple UARTs available).

I will appreciate any advice.

- Bob