Hi Amy Benson, What version of OpenFlows SewerGEMS are you running? Here is a Wiki article to help you - How can I find my registration / license information and version / build number for my Hydraulics and Hydrology products? Was it just recently installed/updated? Another thing to check is the version with which the model was last saved. Here is a Wiki article to help you find that - How to find the version a model was created in and last saved in . You must be in the same version or newer in order to open the model. Also, I don't see a model attached to your post. Larry
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