What happens when no Destination users are assigned to the destination rule - Users are filled programmatically in the destination rule code-

Hi

I am using the following code to fill the destination users - in the destination rule code- for the currrent activity.

I am using the UserManagement webservice to get  a list of users that will be used as destination users.

//Beginning Of code---------------------------------------------------------------------------------------------------------------------------------------------------------------------------

K2.DynamicQueues = K2.Configuration.DynamicQueues;

K2.ResolveQueuesToUsers = K2.Configuration.ResolveQueuesToUsers;

int setCount = K2.Configuration.SetCount;

{

using (UserManagement.WorkflowSvc oService = new WorkflowSvc())

int OfficeID = Convert.ToInt32(K2.ProcessInstance.DataFields["TheOffice"].Value);

string RoleID = K2.ProcessInstance.DataFields["Pay"].Value.ToString();

oService.Url = K2.StringTable["webservice"];

string sUsers = oService.GetAllUsersInOffice(OfficeID, RoleID);

string[] oUsers = sUsers.Split(',');

{                        if (!string.IsNullOrEmpty(oUser))
                            K2.Destinations.Add(DestinationType.User, oUser);
                    }
                }

//End of code

sometimes the paprameters passed to the web service are worng and as a result the sUsers variable is an empty string.

as a result no users are added as a destination and the process instance enters the error mode and doesnt appear in the task list

1. Can i catch the exception and pass it to the Wrapper dll that wraps all the k2 APIs functionality?

2. How can i see (View) the process instances that are in error mode.-using the k2 APIs -?