Some of the mullions you are trying to place are too short for its types, and were not placed on the grid.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)

Syntax

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

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

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

See Also