Modify CMake Error at CMakeLists.txt:284 (add_subdirectory)
Reset libcocos2d_8_1.Windows.vcxproj, libcocos2d_8_1.Windows.vcxproj.filters, libcocos2d_8_1.WindowsPhone.vcxproj,  libcocos2d_8_1.WindowsPhone.vcxproj.filters