Starting program: /usr/local/bin/nitrogen /home/lostson/Wallpaper/1280x1024/
[Thread debugging using libthread_db enabled]
[New Thread -1208899088 (LWP 10936)]
terminate called after throwing an instance of 'Gtk::IconThemeError'

Program received signal SIGABRT, Aborted.
[Switching to Thread -1208899088 (LWP 10936)]
0x009f4402 in __kernel_vsyscall ()
(gdb) 

ok here is the bt 

(gdb) bt
#0  0x0047c402 in __kernel_vsyscall ()
#1  0x0033ed40 in raise () from /lib/libc.so.6
#2  0x00340591 in abort () from /lib/libc.so.6
#3  0x077883a0 in __gnu_cxx::__verbose_terminate_handler ()
   from /usr/lib/libstdc++.so.6
#4  0x07785e85 in std::set_unexpected () from /usr/lib/libstdc++.so.6
#5  0x07785ec2 in std::terminate () from /usr/lib/libstdc++.so.6
#6  0x07785ffa in __cxa_throw () from /usr/lib/libstdc++.so.6
#7  0x07d60d33 in Gtk::IconThemeError::throw_func ()
   from /usr/lib/libgtkmm-2.4.so.1
#8  0x001ec5c7 in Glib::Error::throw_exception ()
   from /usr/lib/libglibmm-2.4.so.1
#9  0x07d61233 in Gtk::IconTheme::load_icon () from /usr/lib/libgtkmm-2.4.so.1
#10 0x080643c3 in NWindow::setup_select_boxes (this=0x9991e40)
    at NWindow.cc:151
#11 0x080663c9 in NWindow (this=0x9991e40) at NWindow.cc:46
#12 0x08053dcc in main (argc=0, argv=0x0) at main.cc:127
(gdb)