Call of sub type failiure, how do i register/check it?

I've writen some code in the solidworks api and i have a line i wish to check if it goes through.
swModel.InsertOffsetSurface 0.01, False
it makes an offset surface on the face im currently on, but sometimes it is not posible and i get no indication of it. How do i check if it went through?
the code around it looks like this:
Do While Not swFace Is Nothing Set swEnt = swFace 'Select through Entity bRet = swEnt.Select4(True, swSelData): Debug.Assert bRet swModel.InsertOffsetSurface 0.01, False swModel.ClearSelection Set swFace = swFace.GetNextFace Loop
Thanks in advance!
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here. All logos and trade names are the property of their respective owners.