FR5994下载失败

FR5994的开发板，下载失败：

1. 如果将IAR-》Linker-》format 配置为other，那么下载不进去

Sun Mar 12, 2017 17:17:39: Using license: Standalone license - IAR Embedded Workbench for Texas Instruments MSP430
Sun Mar 12, 2017 17:17:39: Failed to load debugee: 。。。。。。。

2. 如果将IAR-》Linker-》format 配置为前面那个选项，下载时弹出

点击确认继续下载，然后Debug log窗会出现：

Sun Mar 12, 2017 17:19:44: Illegal register  LEASCIE.LEASCTIE  in interrupt description:
LEA_SC_VECTOR  0x24  2  LEASCIE.LEASCTIE  LEASCIFG.LEASCTIFG
Sun Mar 12, 2017 17:21:54: Warning: Finished loading interrupt definitions. There were 1 error(s), see the log window.
Sun Mar 12, 2017 17:21:54: There was 1 warning during the initialization of the debugging session.

其实没有下载成功。。

代码很简单：

#include "msp430fr5994.h"

int main(void)
{
    WDTCTL = WDTPW | WDTHOLD;               // Stop WDT
    CSCTL0 = CSKEY;                   //password
    CSCTL1 = DCOFSEL0 + DCOFSEL1;     // Set DCO = 8Mhz
    CSCTL2 = SELM__DCOCLK;             // MCLK=DCO
    CSCTL3 = DIVM__1;                 // Divide DCO/1
    
    // Configure GPIO
    P1OUT &= ~BIT0;                         // Clear P1.0 output latch for a defined power-on state
    P1DIR |= BIT0;                          // Set P1.0 to output direction

    PM5CTL0 &= ~LOCKLPM5;                   // Disable the GPIO power-on default high-impedance mode
                                            // to activate previously configured port settings

    while(1)
    {
        P1OUT ^= BIT0;                      // Toggle LED
        __delay_cycles(100000);
    }
}

不知道什么原因。。还望大神分析