hi, i have 2 pc's. one desktop, one latop.
in both i have always successfully compiled my project, but 2 days ago on the latop i have this:
even if i build on device.
here is the screenshot



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solved with this:
Then go to Macintosh HD, then go to Applications folder inside that is another folder called Utilities inside that is an application called Disk Utility.
Double click on that and when it opens you will see your hard drive (usually Macintosh HD) on the left. Highlight your hard drive and click on Verify Disk on the right.
If that is OK click on Repair Permissions. If Verify Disk is not OK try to Repair.

who read this topic, there are other solution i have not tested, i reported here if someone go to my same problem:
$ ln -s /Users/Developer.SnowLeopard/Platforms /Developer/Platforms

restore some hotfix softlinks:
$ dir=/Users/Developer.SnowLeopard $ sudo
ln -s $dir/Platforms /Developer/Platforms $ sudo ln -s [...]