Build error!

[Altera_Forum]

Hi all: 

I added SDRAM mudule to the NIOS II system, and I wanted to test its function.After I builded the system, I wrote a test code. But after I clicked on "build project" in NIOS II IDE, the work interruptted and the software told me that no valid design files found. I am sure that I have added a test file to the project. So this is my problem. Can anyone know the problem and help me!  Thank you very much!

[Altera_Forum]

Hi  

 Clean the project and try If this doent workout try creating a new project    regards M kalyansrinivas

[Altera_Forum]

2 gowilliam 

try to use exaple projects from nios2ide -counter, for exampkle.  I think that problems in absense for IDE design files (it wrote about this - "no valid design files found")

[Altera_Forum]

Thank you all of you! I rebuilded the system again form the beginning,and the error disapeared.But what caused the error? The software?