Problems with "Polygon to Raster" in Modelbuilder when using Lists

Discussion created by ibebirdman on May 12, 2011
I am getting a strange error in ModelBuilder (Arc9.3) when executing a model using a list and the "polygon to raster" function. See the attachment for the model structure.   With the original input set to "single", the model runs flawlessly.  When I change the input to "list", but run it with a single input, it works still.  But with input set to list and 2 layers listed, it always crashes during the "polygon to raster" function.

I get the following error message:

Error 999998: Unexpected Error

Which is distinctly unhelpful. Any ideas on what the problem is?