Got a weird error while executing my programs

I'm a college student (so yeah i'm newb) and i have an error that i've never encountered.

Code:

Qt has caught an exception thrown from an event handler. Throwing
exceptions from an event handler is not supported in Qt. You must
reimplement QApplication::notify() and catch all exceptions there.
 
terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc
 
Program received signal SIGABRT, Aborted.
0x00007ffff5f8bd05 in raise () from /lib/x86_64-linux-gnu/libc.so.6

The stacktrace from gdb return me :

Code:

#0  0x00007ffff5f8bd05 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007ffff5f8fab6 in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007ffff68426dd in __gnu_cxx::__verbose_terminate_handler() ()
   from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#3  0x00007ffff6840926 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#4  0x00007ffff6840953 in std::terminate() ()
   from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#5  0x00007ffff6840aa6 in __cxa_rethrow ()
   from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#6  0x00007ffff6e05bb2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#7  0x00007ffff6e09ecb in QCoreApplication::exec() ()
   from /usr/lib/libQtCore.so.4
#8  0x0000000000404d09 in main ()

here's the whole class: http://pastie.org/2921209

Here's some info I found when trying:
When I comment the line #26 setCentralWidget(widTurtle);

the programme will just execute fine.