Corrupted PDT

Hey. This topic will be of interest only to those who know what the Eclipse PDT is and uses it;)

The very essence.
There are two projects, one works safely with the PDT, and the second does not want to be no different.
What is the problem?

.project Game
<?xml version="1.0" encoding="UTF-8"?>

game





org.eclipse.php.core.PhpIncrementalProjectBuilder





org.eclipse.wst.validation.validationbuilder







org.eclipse.php.core.PHPNature






and .project Flex
')
<?xml version="1.0" encoding="UTF-8"?>
flex







Immediately visible difference;)

Add to Flex:
org.eclipse.php.core.PhpIncrementalProjectBuilder


org.eclipse.php.core.PHPNature


And voila! Everything is working :)