Type 'xxx' could not be resolved

hey

i am running continually into the same problem. when i load an example say the simple socket server example. The first time everything is nice and no errors show up. then if i close nios2 IDE and re open it the code is now full of errors and they all say Type 'xxx ' could not be resolve (between the parentheses there is all bunch a different type used trough the program) this gets very annoying. no matter if i clean it and build it again the errors will stay. I have to reload the temple from scratch every time.

I am sure there is a simple way to fix this but its very annoying problem and i would like to fix it.