IAR error: failed to initialize device

[Vindhyachal.takniki]

1. I am using MSP-EXP430G2 with MSO430G2553 on it.

2. While debugging I get below error:
Emulator: fatal error : failed to reinitialize
Session aborted

3. IAR version: 6.20.1

4. On board all the jumpers: test,rst,rxd,txd & vcc are connected.
I have checked voltage on VDD pin, its : 3.56V
In PC->Device Manager-, com3 is successfully connected.

5. After failures, I have also tried downloaded "msp430.dll_developer_package_rev_3.04.003.004" & replaced "HIL.dll" & "MSP430.dll" files in IAR/430/bin directory also.

6. I have seen that several people had similar issues.

7. I have selecetd project options->FET debugger-> SPI-BY interface. But still same error.