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 * Severe * IP: IDF line~4735 Error detected in Object=BUILDINGSURFACE:DETAILED, name=SURFACE 18 * ~~~ * Field [Construction Name] is required but was blank ***

You haven't define a construction for your surface.

You didn't tag your question properly, did you? I'm thinking that you're using OpenStudio.

 * Severe * IP: IDF line~4735 Error detected in Object=BUILDINGSURFACE:DETAILED, name=SURFACE 18 * ~~~ * Field [Construction Name] is required but was blank ***

You haven't define a construction for your surface.

You didn't tag your question properly, did you? I'm thinking that you're using OpenStudio.OpenStudio. See my answer to the same exact problem here for common causes.

If you're using EnergyPlus only, just find this surface and make sure you're filled something in the "Construction Name" field.