Nios2eds can't detect usbblaster

[Altera_Forum]

My os: Ubuntu 12.04 lts 

 After I configured the .sof file for my de1 board, I tried to program the "hello_world_small" template to the board but i got "no nios ii target connection paths were located. check connections and that a nios ii .sof is downloaded."  My SOPC design is the following: https://www.alteraforum.com/forum/attachment.php?attachmentid=7528  Program "hello_world_small.c": https://www.alteraforum.com/forum/attachment.php?attachmentid=7529  When i selected "run as Nios II Hardware", i received: https://www.alteraforum.com/forum/attachment.php?attachmentid=7530  Please helps..... Thanks!

[Altera_Forum]

Hi. 

Delete the software and create it one more time. If it doesn't help regenerate nios2 system and recompile Quartus II project, then create your Hello world software. I face the same problem from time to time and don't know another way to solve it) Have a nice day.

[Altera_Forum]

Thank for help 

I recompile software, hardware many times, but i get the same problem. I install "Altera Quartus Usb blaster" by creating /etc/udev/rules.d/51-usbblaster.rules:  # Altera USB-Blaster rule to set mode to 666. SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="09fb", ATTRS{idProduct}=="6001", MODE="0666", NAME="bus/usb/$env{BUSNUM}/$env{DEVNUM}", RUN+="/bin/chmod 0666 %c"

[Altera_Forum]

Can you check that FPGA is successfully configured? For example, leds start blinking or conversely stop blinking

[Altera_Forum]

FPGA is successfully configured. Leds stop blinking. :(

[Altera_Forum]

problem is resolved...... 

i add "export QUARTUS_ROOTDIR=/opt/altera/12.0sp1/quartus" in .bashrc file thank you!