Problems generating a Nios project

Hello everyone,

i got the DE0 evaluation Board and want to setup a Nios Processor. I´ve already build a nios system during my master thesis with the altera de3 board.

I got the Nios processor setup in Quartus II 9.0 but when i want to open a project in Nios i get this error message:

1: The software settings (STF) file associated with this project is damaged. This may be fixed by copying your source files into a new C/C+ application project. For more details see the error log.

--> starting a new project in quartus leads to the same error message

2: Project cannot be created

Reason:

java.net.malformedURLException: unkown protocol: c

thanks in advance