[OpenLayers-Users] assertion failed

[Bistrais, Bob]

I'm having a problem trying to build an application with OL3.  I'm trying to use my own WMS layers.  I can get this to display, pan and zoom, but when I try a GetFeatureInfo, my FireBug gives the following error:
AssertionError: Assertion failed

Here is the URL request:
http://localhost:8080/geoserver/ows?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetFeatureInfo&FORMAT=image%2Fpng&TRANSPARENT=true&QUERY_LAYERS=mainebase%3Acounties250&LAYERS=mainebase%3Acounties250&TILED=true&INFO_FORMAT=application%2Fvnd.ogc.gml%2F3.1.1&I=91&J=214&WIDTH=256&HEIGHT=256&CRS=EPSG%3A3857&STYLES=&BBOX=-7827151.696402049%2C5635549.221409474%2C-7514065.628545967%2C5948635.289265555

I don't think there's much to go on here, but was wondering if anyone has any suggestions on what I might look for?
Thanks,
Bob
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