Downloading ELF Process failed in Quartus II 13.0 Service Pack 1

Hi Guys,

I'm going through the "Nios II Hardware Development Tutorial". Everything is ok until I want to download the program to target hardware and run it using Nios II - Eclipse. I right-click the project, then select run as --> nios ii hardware. Then error occurred. In the console window, the error as follow:

0 [main] sh 1264 find_fast_cwd: WARNING: Couldn't compute FAST_CWD pointer. Please report this problem to

the public mailing list cygwin@cygwin.com

0 [main] sh 3924 find_fast_cwd: WARNING: Couldn't compute FAST_CWD pointer. Please report this problem to

the public mailing list cygwin@cygwin.com

[BSP build complete]

0 [main] true 4912 find_fast_cwd: WARNING: Couldn't compute FAST_CWD pointer. Please report this problem to

the public mailing list cygwin@cygwin.com

0 [main] sh 5000 find_fast_cwd: WARNING: Couldn't compute FAST_CWD pointer. Please report this problem to

the public mailing list cygwin@cygwin.com

In the "View Error Log", the error as follow:

!ENTRY com.altera.sbtgui.launch 1 0 2015-04-10 12:24:39.050!MESSAGE Executing: [C:/altera/13.0sp1/quartus\bin\cygwin\bin\bash.exe, -c, nios2-download '--cable=' --instance=-1 --stop --sidp=0x11030 --id=0x0 --timestamp=1428553997]

!ENTRY com.altera.sbtgui.launch 4 0 2015-04-10 12:24:40.956!MESSAGE Failed Executing: [nios2-download, '--cable=', --instance=-1, --stop, --sidp=0x11030, --id=0x0, --timestamp=1428553997] return code: 16

!ENTRY com.altera.sbtgui.launch 1 0 2015-04-10 12:24:41.003!MESSAGE Executing: [C:/altera/13.0sp1/quartus\bin\cygwin\bin\bash.exe, -c, nios2-download '--cable=' --instance=-1 --go --sidp=0x11030 --id=0x0 --timestamp=1428553997 /cygdrive/e/tutorial_altera/first_nios2_system/software/count_binary/count_binary.elf]

!ENTRY com.altera.sbtgui.launch 4 0 2015-04-10 12:24:43.274!MESSAGE Failed Executing: [nios2-download, '--cable=', --instance=-1, --go, --sidp=0x11030, --id=0x0, --timestamp=1428553997, /cygdrive/e/tutorial_altera/first_nios2_system/software/count_binary/count_binary.elf] return code: 16

!ENTRY com.altera.sbtgui.launch 4 0 2015-04-10 12:24:43.274!MESSAGE Downloading ELF Process failed

I'm using Quartus II 13.0 SP1, Windows 8.1 Pro. Please help me.