Develop21_Current Build error

Develop21_Current Build error

[ 85%] Building CXX object src/game/CMakeFiles/game.dir/Object/Object.cpp.o
/home/mangos/server/src/game/Object/Object.cpp: In member function ‘void Object::BuildValuesUpdate(uint8, ByteBuffer*, UpdateMask*, Player*) const’:
/home/mangos/server/src/game/Object/Object.cpp:340:17: error: ‘class UpdateMask’ has no member named ‘AppendToPacket’
updateMask->AppendToPacket(data);
^
src/game/CMakeFiles/game.dir/build.make:1549: recipe for target 'src/game/CMakeFiles/game.dir/Object/Object.cpp.o' failed
make[2]: *** [src/game/CMakeFiles/game.dir/Object/Object.cpp.o] Error 1
CMakeFiles/Makefile2:817: recipe for target 'src/game/CMakeFiles/game.dir/all' failed
make[1]: *** [src/game/CMakeFiles/game.dir/all] Error 2
Makefile:117: recipe for target 'all' failed
make: *** [all] Error 2
oject has been modify by what？I can't build it in debian and Ubuntu. another version is fine.
plz take a look. thx admin.