no background image in Photon Window Manager (OS Image)

I’ve configured the wm.cfg file to have a background image, but pwm is not able to show the background image. It always shows black background. I’ve attached the build file and also the contents of the wm.cfg are as shown below.

[wm config]
fore_color = 0xD8D8D8
active_color = 0x5C8BDF
title_color = 0x65
inactive_color = 0xB1C1D9
base_color = 0xBDBDAA
border_active = 0
placement = 4
text_align = 2
auto_raise = 0
keyboard = 0
focus_cursor = 0
click_front = 1
drag = 1

[background]
vert_align = CENTER
horz_align = CENTER
image_op = PROPORTIONAL STRETCH
image = /usr/share/backdrops/1024x768/default.jpg

This problem was due to a driver (devg-soft3d.so). I just included it in the project, and i’m able to see the backgroung image.