Missing walls

[CharmaineFerguson]

Hey Navisworks experts, I am importing a file from Revit using the Add In and my exterior walls (Brick cavity walls and internal walls - only my weatherboard wall appears) wont appear. You can see that the skirting board (which is a sweep on the wall) appears, but no wall - only the timber frame. I have tried exporting the model to a DWF as well as the Add In - but the DWF wont allow grids to come in - any idea whats going on will my walls.

[CharmaineFerguson]

Here is another image that might help.... i just dont know why my walls didnt come fully in from reivt (and they weren hidden or turned off in my exported revit model either) 

[CharmaineFerguson]

another image of my settings..... can anyone help me?

[CharmaineFerguson]

another image of my settings..... can anyone help me?

[CharmaineFerguson]

PROBLEM SOLVED!
This can be something for Autodesk to solve... I had skirting board sweeps on the model and when I removed the sweep from the wall type, the walls then transferred into Navisworks.... it the wall has a sweep within the type of wall, the wall itself WILL NOT transfer to Navisworks!

That was doing my head in!!!!

Spoiler

Problem Solved of the missing walls