大家好！我生成一个新的项目，然后编译，结果报下面的错误，请问是什么原因？我刚刚接触QT，请指教，谢谢~
mwldsym2.exe: Undefined symbol: 'void QTextStream::setFieldWidth(int) (?setFieldWidth@QTextStream@@QAEXH@Z)'
mwldsym2.exe: referenced from '.data' in main.o
mwldsym2.exe: Undefined symbol: 'void QTextStream::setPadChar(class QChar) (?setPadChar@QTextStream@@QAEXVQChar@@@Z)'
mwldsym2.exe: referenced from '.data' in main.o
mwldsym2.exe: Undefined symbol: 'void QTextStream::setRealNumberPrecision(int) (?setRealNumberPrecision@QTextStream@@QAEXH@Z)'
mwldsym2.exe: referenced from '.data' in main.o
mwldsym2.exe: Undefined symbol: '__declspec(dllimport) struct QMetaObject const QDialog::staticMetaObject (__imp_?staticMetaObject@QDialog@@2UQMetaObject@@B)'
mwldsym2.exe: referenced from '_$static_initializer$6' in moc_TetsQT.cpp:40
mwldsym2.exe: Undefined symbol: 'int E32Main(void) (?E32Main@@YAHXZ)'
mwldsym2.exe: referenced from '__E32Startup' in uc_exe.cpp:46 (EEXE.LIB)
