For HEC-HMS model, found an ERROR 15256 : METEOROLOGICAL MODEL IS NOT SET UP TO WORK WITH BASIN MODEL. Kindly, let us know the resolution.
HEC models are supported by the US Army Corps of Engineers by subscription. While there may be a SME participating in the forums, it's not likely that a member of Esri Technical Support will have expertise in this tool.
Here's a link to the Hydrologic Engineering Center Modelling System docs:
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