用designer设计的界面，编译一切正常，可是运行不了，显示：strive@strive-laptop:~/project/qt/gra$ ./gra
QSocket::writeBlock: Socket is not open
QSocket::writeBlock: Socket is not open
QSocket::writeBlock: Socket is not open
QSocket::writeBlock: Socket is not open
No Qt/Embedded server appears to be running.
If you want to run this program as a server,
add the "-qws" command-line option.
但是有的qt项目是可以正常运行的，为什么？
