Only change the pin of the uart, error occur

hi,
What I have done is change the pin of the uart, the JLink Warning: CPU could not be halted.
#define GPIO_UART1_TX_PORT GPIO_PORT_2//0
#define GPIO_UART1_TX_PIN GPIO_PIN_8//4
#define GPIO_UART1_RX_PORT GPIO_PORT_2//0
#define GPIO_UART1_RX_PIN GPIO_PIN_9//5

**JLink Warning: CPU could not be halted
***JLink Error: Can not read register 15 (R15) while CPU is running
***JLink Error: Can not read register 16 (XPSR) while CPU is running
***JLink Error: Can not read register 0 (R0) while CPU is running
***JLink Error: Can not read register 1 (R1) while CPU is running
***JLink Error: Can not read register 2 (R2) while CPU is running
***JLink Error: Can not read register 3 (R3) while CPU is running
***JLink Error: Can not read register 4 (R4) while CPU is running
***JLink Error: Can not read register 5 (R5) while CPU is running
***JLink Error: Can not read register 6 (R6) while CPU is running
***JLink Error: Can not read register 7 (R7) while CPU is running
***JLink Error: Can not read register 8 (R8) while CPU is running
***JLink Error: Can not read register 9 (R9) while CPU is running
***JLink Error: Can not read register 10 (R10) while CPU is running
***JLink Error: Can not read register 11 (R11) while CPU is running
***JLink Error: Can not read register 12 (R12) while CPU is running
* * * JLink错误:无法读取寄存器13 (R13) while CPU is running
***JLink Error: Can not read register 14 (R14) while CPU is running
***JLink Error: Can not read register 15 (R15) while CPU is running
***JLink Error: Can not read register 16 (XPSR) while CPU is running
***JLink Error: Can not read register 17 (MSP) while CPU is running
***JLink Error: Can not read register 18 (PSP) while CPU is running
***JLink Error: Can not read register 20 (CFBP) while CPU is running

thanks