Hello all. I am looking for someone to help me out with a recurring issue I am having when using the 'generate tessellation' tool in arcgis' model builder. I am working with a shape file that is in a projected coordinate system that I am not able to generate a tessellation on. Every time I try to generate one, I get this error message:

This is the tool that I am using. A projected shape file is connecting to the create spatial reference tool and is also connecting to the red generate tessellation bubble. When I do not use the "create spatial reference tool", I get the same error message.

@DuncanHornby Do you or other have thoughts ?
Thank you.