Modern Warfare 2 error

RH - Sep 7, 2015 at 10:47 AM

While playing COD: MW2 Single player campaign, I keep receiving an error:

'tried to blend between sound aliases aagun_fire_skyburst and shellshock_loop_silent, but they don't use the same sound file'

After this, the game automatically returns to the menu.
Does anyone have a way to fix this?