The two surfaces you are trying to merge are disconnected from one another. They should overlap, or at least share edges.

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

Syntax

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

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

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

See Also