Unable to build using Xcode 4 - The selected run destination is not valid for this action

Question

So I\'m horribly confused by this error, other threads on Stack Overflow mention I should set the SDK, but I see no option to do this. I\'m trying to build:http://wafflesoftwar

Answer 1

Kind of amazing that none of the answers here solved the issue for me, but I figured it out. Forget restarting Xcode, or using Autocreate Schemes, still only 64-bit will show up as a valid destination in the scheme.

The correct solution is to change the Architecture for your project. Go to Build Settings (in the root node of your project), and change Architecture to 32-bit Intel, it's right above the Base SDK setting. Destination will instantly switch to "My Mac 32-bit". HTH somebody.

Answer 2

Ran into the same error message ("The selected run destination is not valid for this action") when attempting to use XCode 4 to build/run a tiny Objective-C "Hello, World" project I created in XCode 3.x. Fixed it by choosing to "Manage Schemes..." from the drop-down menu to the right of the Stop button, deleting the one scheme on the list (click checkbox beside the scheme, then click the "-" button at the bottom left), and then clicking "Autocreate Schemes Now".

I also needed to change the "Base SDK" from 10.5 to 10.6, by clicking on 'folder' icon (beneath the Run button), clicking the root/top of the tree view below it, clicking on the blue icon below "PROJECT" in the pane just to the right, and then finally, choosing "Latest Mac OS X (Mac OS X 10.6)" to the right of that.

Answer 3

I had this issue today. I found switching Base SDK from Latest iOS (4.3) to iOS 4.3 fixed everything.

Answer 4

This will happen if XCode believes your mac is a 64-bit machine, when really it's a 32-bit. If this is the case for you, simply click on your project icon from the far-left pane - it's the menu item that displays your project name next to a little blue icon. This should bring up a center pane that says "PROJECT" at the top. Highlight your project name, and the third pane should now show your build settings. The first item is "Architectures" which will allow you to specify if you are building a 32-bit or 64-bit application.

Answer 5

Xcode 4.5. I was trying to compile for 10.6. It seemed to be stuck on 64 bit just because it couldn't find the sdk. I didn't get any message about it not finding the sdk.

I first tried to put in the correct path to /Developer-3.2.6/SDKs/MacOSX10.6.sdk but xcode didn't want to find it there. Then I copied that folder into 4.5 next to the other OSX Platform sdk (new location I think just look in the bundle).

And magically my 32 bit came back.

So my conclusion is that the 32/64 bit option is really dependent on whether xcode can verify the sdk that you're trying to use. Being stuck at 64 while trying to compile for 32 gives the error without notifying you that its first issue is that the sdk can't be found.

Answer 6

I had this issue and maybe it was a coincidence but when I restarted XC4 but this time didn't choose to load my project from the popup window that appears on launch - instead choosing it explicitly from the File menu - the issue didn't occur and the build started ok.

On the 3 or 4 occasions I had this error, I had chosen to load the project from the popup window that appears when XC4 first loads.

As I say, I might have just got lucky, but I certainly didn't make any other changes to the projects to 'fix' the issue.