[MapProxy] Grid Assert Error for WMTS.

[Raffaello Bertini]

I've got an error with mapproxy 1.4 when a clients request a wmts map.
here the error:

*  File
"C:\Python27\lib\site-packages\mapproxy-1.4.0-py2.7.egg\mapproxy\service\*
*wmts.py", line 193, in __iter__*
*    origin = self.grid.origin_tile(level, 'ul')*
*  File
"C:\Python27\lib\site-packages\mapproxy-1.4.0-py2.7.egg\mapproxy\grid.py"*
*, line 443, in origin_tile*
*    assert self.supports_access_with_origin(origin), 'TODO error exception'
*
*AssertionError: TODO error exception*
*
*
my mapproxy config is without TMS and with WMS  WMTS KML.demo

the grid config:
*grids:*
*  global_mercator_osm:*
*    origin: nw*
*    #base: GLOBAL_MERCATOR*
*    srs: 'EPSG:4326'*
*    num_levels: 22*
*
*
Can Someone help me to resolve this problem?
thanks.
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