The mullion(s) you are trying to place is too short for his type, and was not placed on the grid.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0)

Syntax

C#
`public static FailureDefinitionId AllMullionsAreTooShort { get; }`

Visual Basic
`Public Shared ReadOnly Property AllMullionsAreTooShort As FailureDefinitionId Get`

Visual C++
`public: static property FailureDefinitionId^ AllMullionsAreTooShort { FailureDefinitionId^ get (); }`

See Also