Linux Mint with RTAI

Print file information:
RUN_IN_PLACE=no
LINUXCNC_DIR=
LINUXCNC_BIN_DIR=/usr/bin
LINUXCNC_TCL_DIR=/usr/lib/tcltk/linuxcnc
LINUXCNC_SCRIPT_DIR=
LINUXCNC_RTLIB_DIR=/usr/realtime-3.4-9-rtai-686-pae/modules/linuxcnc
LINUXCNC_CONFIG_DIR=
LINUXCNC_LANG_DIR=/usr/share/linuxcnc/tcl/msgs
INIVAR=inivar
HALCMD=halcmd
LINUXCNC_EMCSH=/usr/bin/wish8.5
LINUXCNC - 2.7.2-26-gdbf34f6
Machine configuration directory is '/home/jtc/linuxcnc/configs/sim.axis'
Machine configuration file is 'axis_9axis.ini'
INIFILE=/home/jtc/linuxcnc/configs/sim.axis/axis_9axis.ini
PARAMETER_FILE=sim-9axis.var
TASK=milltask
HALUI=halui
DISPLAY=axis
Starting LinuxCNC...
Starting LinuxCNC server program: linuxcncsvr
Loading Real Time OS, RTAPI, and HAL_LIB modules
Starting LinuxCNC IO program: io
Starting HAL User Interface program: halui
Found file(lib): /usr/share/linuxcnc/hallib/core_sim9.hal
Found file(lib): /usr/share/linuxcnc/hallib/sim_spindle_encoder.hal
Found file(lib): /usr/share/linuxcnc/hallib/axis_manualtoolchange.hal
Found file(lib): /usr/share/linuxcnc/hallib/simulated_home.hal
Found file(lib): /usr/share/linuxcnc/hallib/locking_indexer.hal
Starting TASK program: milltask
Starting DISPLAY program: axis
Unexpected realtime delay: check dmesg for details.
Shutting down and cleaning up LinuxCNC...
Killing task linuxcncsvr, PID=2889
Killing task milltask, PID=2956
task: 513 cycles, min=0.000018, max=0.008041, avg=0.002026, 0 latency excursions (> 10x expected cycle time of 0.001000s)
Removing HAL_LIB, RTAPI, and Real Time OS modules
Removing NML shared memory segments

Debug file information:
.
.
Traceback (most recent call last):
  File "/usr/bin/axis", line 3133, in <module>
    o = MyOpengl(widgets.preview_frame, width=400, height=300, double=1, depth=1)
  File "/usr/bin/axis", line 352, in __init__
    Opengl.__init__(self, *args, **kw)
  File "/usr/lib/pymodules/python2.7/rs274/OpenGLTk.py", line 164, in __init__
    apply(RawOpengl.__init__, (self, master, cnf), kw)
  File "/usr/lib/pymodules/python2.7/rs274/OpenGLTk.py", line 112, in __init__
    Togl.__init__(self, master, cnf, **kw)
  File "/usr/lib/pymodules/python2.7/rs274/OpenGLTk.py", line 38, in __init__
    Widget.__init__(self, master, 'togl', cnf, kw)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 2058, in __init__
    (widgetName, self._w) + extra + self._options(cnf))
_tkinter.TclError: NULL main window
2889
  PID TTY      STAT   TIME COMMAND
2956
  PID TTY      STAT   TIME COMMAND
Stopping realtime threads
Unloading hal components