kdevelop build error: cmake error?

[ 94%] Building CXX object kdevdesigner/designer/CMakeFiles/libkdevdesignerpart-module.dir/actiondnd.cpp.o /trinity.source/kdevelop/kdevdesigner/designer/kdevdesigner_part.cpp:565:33: fatal error: kdevdesigner_part.moc: No such file or directory compilation terminated. make[2]: *** [kdevdesigner/designer/CMakeFiles/libkdevdesignerpart-module.dir/kdevdesigner_part.cpp.o] Error 1 make[2]: *** Waiting for unfinished jobs....