IndexOutOfRangeException Deep in the bowels of NHibernate

Yes its a common problem, you are using the Column "EndDate" twice in your mapping definition (for both Company and PrimaryListing) and that is not allowed. One of them has to go, or have an additional EndDate column (one for each association)

check this too
nHibernate 2.0 – mapping a composite-id *and* many-to-one relationship causes “invalid index” error

and
http://devlicio.us/blogs/derik_whittaker/archive/2009/03/19/nhibernate-and-invalid-index-n-for-this-sqlparametercollection-with-count-n-error.aspx

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