Exception thrown using FamilyType.ByFamilyAndName in DesignScript definition

[ThomasMahon]

Dynamo Verison

1.0.0 Revit 2016

Operating system

Win 10

What did you do?

I created a DesignScript definition which converts a string (coming from Excel) to a Family Type.

What did you expect to see?

Return the specified Family Type from the input formatted/processed text

What did you see instead?

When I used the FamilyType.ByFamilyAndName method in DesignScript Dynamo throws an exception and deletes the Family from the project!

See the example image - it shows the same method working using the node. When I process the same data from Excel (although its in the format of "Family A"), I use the String methods to extract the Family Type (i.e. "A") and the same method shown in the image to return the Family - I also TrimWhiteSpace to rule out any rogue spaces. Then the error described above occurs.

Heres the diagnostics

Object reference not set to an instance of an object.

at Dynamo.UI.Controls.PreviewControl.<>c__DisplayClassc.b__b(AsyncTask m)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)