¿A qué podría deberse error al intentar ver las unidades administrativas al crear un nuevo omni-expediente?

Evolution 1.11.0.0
SQL Server

OmniExpediente

Estoy creando un nuevo expediente, y al dar clic al icono de la tuerca que muestra el listado de Unidades Administrativas, se genera el mensaje "Error durante la serialización o deserialización mediante JavaScriptSerializer de JSON. La longitud de la cadena supera el valor establecido en la propiedad maxJsonLength."

¿A qué podría deberse este error?

A continuación, les comparto el error registrado en el elmah:

System.Web.HttpException (0x80004005): Error al ejecutar la solicitud secundaria para el controlador System.Web.Mvc.HttpHandlerUtil+ServerExecuteHttpHandlerWrapper. ---> System.Web.HttpUnhandledException (0x80004005): Se produjo una excepción de tipo 'System.Web.HttpUnhandledException'. ---> System.InvalidOperationException: Error durante la serialización o deserialización mediante JavaScriptSerializer de JSON. La longitud de la cadena supera el valor establecido en la propiedad maxJsonLength.
   en System.Web.Script.Serialization.JavaScriptSerializer.Serialize(Object obj, StringBuilder output, SerializationFormat serializationFormat)
   en System.Web.Script.Serialization.JavaScriptSerializer.Serialize(Object obj, SerializationFormat serializationFormat)
   en System.Web.Helpers.Json.Encode(Object value)
   en ASP.areas_estructura_views_unidad_indexomex_ascx.__Render__control1(HtmlTextWriter __w, Control parameterContainer)
   en System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   en System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   en System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   en System.Web.Mvc.ViewPage.Render(HtmlTextWriter writer)
   en System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   en System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   en System.Web.UI.Page.HandleError(Exception e)
   en System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   en System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   en System.Web.UI.Page.ProcessRequest()
   en System.Web.UI.Page.ProcessRequest(HttpContext context)
   en System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.<>c__DisplayClass4.<Wrap>b__3()
   en System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.Wrap[TResult](Func`1 func)
   en System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride)
   en System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride)
   en System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage)
   en System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm)
   en System.Web.Mvc.ViewPage.RenderView(ViewContext viewContext)
   en System.Web.Mvc.ViewUserControl.RenderViewAndRestoreContentType(ViewPage containerPage, ViewContext viewContext)
   en System.Web.Mvc.ViewUserControl.RenderView(ViewContext viewContext)
   en StackExchange.Profiling.Mvc.WrappedView.Render(ViewContext viewContext, TextWriter writer) en d:\Files\GitHub\miniprofiler\dotnet\StackExchange.Profiling.Mvc\WrappedView.cs:línea 56
   en System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context)
   en System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   en System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   en System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   en System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   en System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   en System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   en System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   en System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult)
   en System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult)