Asp.net mvc - null parameter exception - could be routing problem?

Method parameters in ASP.NET MVC match up 1-1 with route parameters. Since you have no routes that take in a route value named umi no route will catch what you're trying to do.

You don't have a route for CaseManagers/PostItems/ViewByUmi/1234 and it would appear that it is taking ViewByUmi and try to convert it to an System. Int32 because it is falling into the Default route. If you create a Route for your CaseManagers you should no longer have this problem.

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