Abstract Class Mappings

If you’re running into this error in NHibernate:

System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: Attempting to parse a null value into an sql string.

Examine your mappings for abstract classes that aren’t implemented, or classes that are marked as abstract in the mappings but not in the c# file. I was refactoring out some abstract classes in the middle and forgot to delete the abstract=”true” line in the mapping.

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