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Revit Based HydraCALC (Ribbon/Toolbar/Location)
Description:
Unhandled Exception - System.FormatException: Input string was not in a correct format
Sprinklers are missing some important parameters required for Hydraulic Calculations to function (Coverage Area, Density, Minimum Pressure, etc.)
Change the specified properties on the sprinklers to have the appropriate information in them. If you can find the specific sprinklers that are causing this issue, you can fix it manually.
However, if you need to fix a large number of sprinklers, open up the Sprinkler Schedule, and on the right-hand side under Fields, add those properties mentioned above to appear and assign them values from inside the schedule.
If you need more detailed instructions to follow along to, there is a video provided that you can watch here.