Web Viewer Viewing Error - "The parameters dictionary contains a null entry for parameter 'batchIndex'...

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The parameters dictionary contains a null entry for parameter 'batchIndex' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ContentResult GetNodeChildren(System.Collections.Generic.List`1[FileBoundV6.Helpers.PathInfo], Int32, Int64[])' in 'FileBoundV6.Controllers.WebController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter. Parameter name: parameters