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  1. Hi, Instead of digitizing left and right banks for the purpose of floodplain modeling, I am trying to create buffers around the streams and use those instead. I am creating buffers around streams and dissolving them into one buffer then converting polygon to polyline and spliting the polyline at the upstream end of each stream (If I do not split, only one bank point will be created in the cross section. I am guessing because the polyline ID is the same on either side). I then give each side on each segment a unique ID so if we have 10 streams in the watershed, I end up with 20 segments with 20 unique IDs. I bring in the polyline into WMS but I get the error message mentioned in the subject above. Any ideas as to what is causing this? I am using WMS 9.1 64-bit with a build date of 8/26/2013. The polylines are generated in ArcMap 9.3.1. Thanks.