LineRenderer not Displaying in 2D

I'm trying to create a line when the player clicks, drags, and then releases the mouse. The object is created with all the right components, but nothing is displayed and isVisible is false. The collider does not show up in gizmo view either.

The components are visible and editable in the hierarchy, but not in the game. Here's my code: (m_barrierMaterial)is a public material that has worked in other instances)

 barriers.Add( new GameObject( "Barrier" ) );
 GameObject barrier = barriers[barriers.Count - 1];
 LineRenderer line = barrier.AddComponent<LineRenderer>() as LineRenderer;
 line.material = m_barrierMaterial;
 line.SetVertexCount( 2 );
 line.SetPosition( 0, startPoint );
 line.SetPosition( 1, endPoint );
 
 BoxCollider2D collider = barrier.AddComponent<BoxCollider2D>() as BoxCollider2D;