error in QT4

hi,
I have found an error in QT like

1: error: collect2: ld returned 1 exit status

whats the reason ...i have checked all the parameters ,etc
thanks
reply

This is not an error of Qt, this is an error message of your linker!
In the lines before this message should be something like "unresolved symbol". Well, this is the most likely linker error. It may be another error, but it is still from the linker, not Qt.

If you could show us the last 15 (?) lines we could tell you what the linker does not like.