Base SDK Missing [duplicate]

This question already has answers here: Closed 10 years ago.

Possible Duplicate:

Install xCode 3.2.3 w/ iPhone SDK 4, get “Base SDK missing”, can't see other SDKs

I just upgraded my xcod开发者_StackOverflowe directly from the website i.e. I downloaded the new version of xcode which came with ios4 - yet when I finished installing everything including the SDK it now says base sdk missing?!?

---

you have du update your app, too.

in Groups & Filesklick on Targets and doubleclick you application. then select your configuration and search for Base SDK under the Architectures section. select the 4.0 there