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THE PROBLEM OF UART

I download the SDK  at  https://www.nordicsemi.com/eng/nordic/Products/nRF5-SDK/nRF5-SDK-zip/59011 . When I used  "nRF5_SDK_15.0.0_a53641a\examples\ble_central\ble_app_uart_c " ,  it run ok.  But  when I  changed  the  define of RX_PIN_NUMBER  at  pca10040.h . The software doesn't run. The J-LINK shows  "  0> <error> app: Communication error occurred while handling UART. ".

And i found RX_PIN_NUMBER must be defined to 8.  if the RX_PIN_NUMBER be defined to any number, the software doesn't run.

WHY? please help me. thank you.  My board is uesd 52832.