Hello
I ve got this exception "collection was modified; enumeration operation may not execute" during service initialisation.

It is thrown in Oddr.Builders.Devices.TwoStepDeviceBuilder.AfterOrderingCompleteInit after the first call of SortElement(step1Token);

foreach (String step1Token in orderedRules.Keys)
{
            SortElement(step1Token);
}

This exception was thrown because SortElement modifies orderedRules.Keys collection.

To solve the issue, I changed the code by :

String[] stringKeys = new String[orderedRules.Keys.Count];
orderedRules.Keys.CopyTo(stringKeys, 0);
foreach (String step1Token in stringKeys)
{ 
            SortElement(step1Token);
}