Panda3d unable to open directx window - python-2.7

Question

I recently installed panda3d version 1.8.1 which was termed as latest stable release.But when I typed the following code
from direct.showbase.ShowBase import ShowBase
class MyApp(ShowBase):
def __init__(self):
ShowBase.__init__(self)
app = MyApp()
app.run()
The above code generated the following error message :
:ShowBase(warning): Unable to open 'onscreen' window.
Traceback (most recent call last):
File "D:\delme.py", line 8, in <module>
app = MyApp()
File "D:\delme.py", line 6, in __init__
ShowBase.__init__(self)
File "C:\Panda3D-1.8.1\direct\showbase\ShowBase.py", line 244, in __init__
self.openDefaultWindow(startDirect = False, props=props)
File "C:\Panda3D-1.8.1\direct\showbase\ShowBase.py", line 880, in openDefaultWindow
self.openMainWindow(*args, **kw)
File "C:\Panda3D-1.8.1\direct\showbase\ShowBase.py", line 916, in openMainWindow
self.openWindow(*args, **kw)
File "C:\Panda3D-1.8.1\direct\showbase\ShowBase.py", line 671, in openWindow
raise StandardError, 'Could not open window.'
StandardError: Could not open window.
Any ideas why is this happening and how do I resolve it??

Answer 1

I solved the problem myself.
I edited panda3d1.8.1/etc/config.txt
I changed : load-display pandadx9
to : load-display p3tinydisplay