unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: unable to load symbol file: warning: Unable to read symbols for /Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3.3 (8C148)/Symbols/usr/lib/info/dns.so (file not found).warning: UUID mismatch detected with the loaded library - on disk is:/Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.3.3 (8C148)/Symbols/usr/lib/libxml2.2.dylib
这个错误困扰了一天，用device编译的时候，总是观点app之后，重新打开才行，而且速度非常的慢！
以下是解决方法：
去到/Developer/Platforms/iPhoneOS.platform/DeviceSupport/ 把对应的/4.3.3 (8C148)这个目录删除掉后 ，重新打开xcode并插上ipad或iphone 使用XCode 的Organizer重新收集一下设备信息 xcode 4.0.3版的organizer 在又上角！
然后编译就ok了