EK-TM4C123GXL: UART1 interrupt problem

This my uart code. When i change uart1 interrupt, it doesn't work. but uart0 wroks.  Where is my mistake?
Thanks


#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "driverlib/debug.h"
#include "driverlib/fpu.h"
#include "driverlib/gpio.h"
#include "driverlib/interrupt.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/sysctl.h"
#include "driverlib/uart.h"
#include "utils/uartstdio.h"



														 
void ConfigureUART0(void)
{
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
    ROM_GPIOPinConfigure(GPIO_PA0_U0RX);
    ROM_GPIOPinConfigure(GPIO_PA1_U0TX);
    ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
    UARTClockSourceSet(UART0_BASE, UART_CLOCK_PIOSC);
    UARTStdioConfig(0, 115200, 16000000);
}

void ConfigureUART1(void)
{
	SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
	SysCtlPeripheralEnable(SYSCTL_PERIPH_UART1);
	GPIOPinConfigure(GPIO_PB0_U1RX);
	GPIOPinConfigure(GPIO_PB1_U1TX);
	GPIOPinTypeUART(GPIO_PORTB_BASE, GPIO_PIN_0 | GPIO_PIN_1);
	UARTClockSourceSet(UART1_BASE, UART_CLOCK_PIOSC);
        UARTConfigSetExpClk(UART1_BASE, 16000000, 115200, (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE));
	UARTEnable(UART1_BASE);
}	


//*****************************************************************************
//
// The UART interrupt handler.
//
//*****************************************************************************
void UARTIntHandler(void)
{

 unsigned long ulStatus;

 // Get the interrrupt status.
 ulStatus = ROM_UARTIntStatus(UART1_BASE, true);

 // Clear the asserted interrupts.
 ROM_UARTIntClear(UART1_BASE, ulStatus);

 // Loop while there are characters in the receive FIFO.
 while (ROM_UARTCharsAvail(UART1_BASE)) {
  // Read the next character from the UART and write it back to the UART.
  ROM_UARTCharPutNonBlocking(UART1_BASE, ROM_UARTCharGetNonBlocking(UART1_BASE));
 }

			
        GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2);

        SysCtlDelay(SysCtlClockGet() / (1000 * 3));

        GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0);

    
}

//*****************************************************************************
//
// Send a string to the UART.
//
//*****************************************************************************
void UART0Send(const uint8_t *pui8Buffer, uint32_t ui32Count)
{
    while(ui32Count--)
    {
        ROM_UARTCharPutNonBlocking(UART0_BASE, *pui8Buffer++);
    }
}

void UART1Send(const uint8_t *pui8Buffer, uint32_t ui32Count)
{
    while(ui32Count--)
    {
        ROM_UARTCharPutNonBlocking(UART1_BASE, *pui8Buffer++);
    }
}




//*****************************************************************************
//
// This example demonstrates how to send a string of data to the UART.
//
//*****************************************************************************
int main(void)
{

    ROM_FPUEnable();
    ROM_FPULazyStackingEnable();
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |SYSCTL_XTAL_16MHZ);
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
   
    // Enable the GPIO pins for the LED (PF2).
    ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_2);

                ConfigureUART0();
		ConfigureUART1();	
			
	 
    ROM_IntMasterEnable();
    ROM_IntEnable(INT_UART1);
    ROM_UARTIntEnable(UART1_BASE, UART_INT_RX | UART_INT_RT);


    // Prompt for text to be entered.
    UART0Send((uint8_t *)"\033[2JEnter text: ", 16);
		UART1Send((uint8_t *)"UART1\n\r", 7);
	//	UART2Send((uint8_t *)"UART2\n\r", 7);

    while(1)
    {
					

    }
}