Hello, sorry you are having this issue.
Does this happen if you build the stand alone again?
The error message states an image is missing, there are many possible images that this could be, including textures you may have used on an object.
Are you using custom or store bought media, or is this just with the media that came with the GameGuru install?
You can email the map file to me at myke1net at hotmail.com and I will look at it.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit