PySide in Eclipse generates false errors

PyDev starts generating false errors for my code after installing PySide.

To fix this problem follow this steps:
1. In Eclipse open Window -> Preferences -> Pydev -> Interpreter - Python
2. Add C:\Python27\Lib\site-packages to SystemPYTHONPATH (if you already have it... remove this line and add it again)

Installing Eclipse IDE for C++ and QT with MinGW on Windows

Follow next steps to install Eclipse IDE for C++ and QT with MinGQ on Windows:
1. Instal MinGW (with MSYS) http://sourceforge.net/projects/mingw/files/
2. Install gdb-6.3-2.exe http://citylan.dl.sourceforge.net/project/mingw/MinGW/BaseSystem/GDB/Release%20Candidate_%20gdb-6.3/gdb-6.3-2.exe
3. Add path to MinGW and MSYS folder (for me it's C:\MinGW\bin;C:\MinGW\msys\1.0\bin;) to system variable (PATH)
4. Install QT (qt-win-opensource-4.6.4-mingw.exe) http://get.qt.nokia.com/qt/source/qt-win-opensource-4.6.4-mingw.exe
5. Install Eclipse IDE for C/C++ Developers (includes Incubating components), http://www.eclipse.org/downloads/ - just download and unzip it. INSTALL 32-bit version (and of course you need JRE 32-bit version ...for example this one jre-6u27-windows-i586.exe from here http://www.oracle.com/technetwork/java/javase/downloads/jre-6u27-download-440425.html
6. install QT Eclipse integration http://get.qt.nokia.com/qteclipse/qt-eclipse-integration-win32-1.6.1.exe
7. Reboot and then Run Eclipse
8. In eclipse Preferense->Qt press "Add new Qt version"... and add path to your ...\qt\4.4.1\bin folder