Sequence contains no elements error

[broderickhyman]

The following error occurred after a simple property and method export:
System.InvalidOperationException: Sequence contains no elements
at System.Linq.Enumerable.Aggregate[TSource](IEnumerable1 source, Func3 func)
at InnovatorAdmin.DatabasePackage.Write(InstallScript script, Func2 errorHandler, Action2 reportProgress) in C:\Users\eric.domke\Documents\Code\InnovatorAdmin\InnovatorAdmin.Api\IO\DatabasePackage.cs:line 63
at InnovatorAdmin.InstallProcessor.InstallLines() in C:\Users\eric.domke\Documents\Code\InnovatorAdmin\InnovatorAdmin.Api\Install\InstallProcessor.cs:line 237