Can't run BLT program more than once?

[Todd Krein]

I'm running activestate Python 2.4 for windows, and the latest BLT,
under XP. I'm using pythonWin as my environment.

When I run my plotting program the first time, it works just fine. If I
exit out (normally), and then run it again from PythonWin, I get the
following error. It's as if something isn't getting properly
re-initialized. If I quit out of PythonWin, and relaunch it, I can run
the program again, once. Any ideas?



Error: 1
TclError Exception in Tk callback
  Function: <bound method PathEval.doOpenTrace of <__main__.PathEval
instance at 0x0127AC60>> (type: <type 'instancemethod'>)
  Args: ()
Traceback (innermost last):
  File "C:\Python24\lib\Pmw\Pmw_1_2\lib\PmwBase.py", line 1747, in
__call__
    None
  File
"C:\NBU\perforce\hardware\test\home_survey\data\home_007\raw_data\KitchenToDen\AMPLITUDE\PathEval.py",
line 89, in doOpenTrace
    self.doPlotTrace()                          # go plot the thing
  File
"C:\NBU\perforce\hardware\test\home_survey\data\home_007\raw_data\KitchenToDen\AMPLITUDE\PathEval.py",
line 117, in doPlotTrace
    self.graph = Pmw.Blt.Graph(tkRoot)                   # make a new
graph area
  File "C:\Python24\lib\Pmw\Pmw_1_2\lib\PmwBlt.py", line 260, in
__init__
    None
  File "C:\Python24\lib\lib-tk\Tkinter.py", line 1861, in __init__
    self.tk.call(
TclError: invalid command name "::blt::graph"