Hi there.
Unfortunately this is not one of the known issues. We can see "System.ArgumentException", but without stack trace information we unfortunately won't be able to tell what exactly is happening.
If you have applications registered, could you please unregister all applications and see if Cassini still fails when the service is started. This is, unfortunately, is not something we have a solution for. If you wish, you could send us the event log file for analysis. If you like to do that, please uninstall UltiDev Cassini, clean up the Event Log (Application), then install the product again, reproduce the problem, export event log as .EVTX file and
contact us via email so we could provide you an email address where to send the event log file.
Best regards,
UltiDev Team.
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