.app file appears in red (missing) in new projects with Xcode 4

Every time I create an Xcode 4 project (iPhone app, cocoa library...) the .app file or the .a file under Products group appears in red (is missing).

Even if I build the project the file stills in red.

All my settings are default.

Solution 1:

Try Building and Running on a device, I've noticed the same red text problem, but selected my iPhone and the red text has disappeared.

Solution 2:

I have solved the problem with the following process:

1. Select projectname -> Click project -> Build Setting -> Search "Per-configuration Build Products Path"

2. Remove the extra string from there.

3. Finally confirm you have to add $(BUILD_DIR)/$(CONFIGURATION)