No Nios II target connection paths were located.

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I am trying to execute a hello world program using cyclone 2 fpga. In run configurations, after clicking on refresh connections, an error "No Nios II target connection paths were located. Check connections and that a Nios II .sof is downloaded." appears.

I have successfully downloaded .sof file onto the fpga but right after that when i click on refresh connections, no connections are shown.

Kindly help!

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I could solve that issue... i had to set the unused pins in quartus to "input tri state".

but now, after building the project in nios 2 eclipse, when I run as nios 2 hardware, I get an error saying "downloading ELF process failed"

I dont know what to do. please reply if anyone has solved this issue.

I repeat again, that i am trying to execute the "hello world" program. The timestamp and system id are matched.

thanks in advance.