.obj object-can't find texture

I'm trying to import a .obj that I exported from Cinema4d. I can
import the object no problem, but my texture I applied in C4D can't be
found, I get the error: "jit.gl.model: can'f find material "Mat". which
is my default texture name. I have the texture in the proper path. In
the examples the models with included textures have them in the same
folder, with a text file like this:

#
# Wavefront material file: d:objets webobjetsappleapple.mtl
#
# Bounding box of geometry = (23.5545,0.709068,-36.6852) to
(88.9368,78.2681,32.2648).

newmtl material__14
    Ns 6
    d 1
    illum 2
    Kd 0.347059 0.192157 0.0
    Ks 0.044902 0.044902 0.044902
    Ka 0.211765 0.0628877 0.123209
    map_Kd stem_color.tif

newmtl material__13
    Ns 6
    d 1
    illum 2
    Kd 0.892157 0.188235 0.078431
    Ks 0.1 0.05 0.2
    Ka 0. 0. 0.
    map_Kd skin.tif

Should this have been exported along with the .obj for the texture to
work properly? Did I miss some basic thing here?
Thanks.
Brian