NHibernate.NonUniqueResultException: List

Question

I have the following problem, when compiling my application, it returns the following error:

 

 

NHibernate.NonUniqueResultException: query did not return a unique result: 2    

in NHibernate.Impl.AbstractQueryImpl.UniqueElement (IList list)    

in NHibernate.Impl.CriteriaImpl.UniqueResult ()    

in NHibernate.Impl.CriteriaImpl.UniqueResult [T] ()    

in SDPJDomain.DataAccess.ProcessOID.ConfirmProcessor (String numProcess) 

in D: \ SVN \ SDP \ SDPJ \ branches \ SDPJ-V3.0.0 \ SDPJDomain \ 

DataAccess \ ProcessData.cs: line 111

public static Process ConsultforNProcessER(string numProcess)
        {
            ISession session = NhibernateHelper.SessionCurrent;
            Process process;

            try
            {
                process = new Process();

                ICriteria criteria = session.CreateCriteria(process.GetType());
                //criteria.Add(NHibernate.Criterion.Expression.Sql("replace(replace(replace(Num_Proc_Judicial, '.'), '-'), '/') = replace(replace(replace(?, '.'), '-'), '/')", numProcess, NHibernateUtil.String));
                criteria.Add(NHibernate.Criterion.Expression.Sql("regexp_replace(Num_Proc_Judicial || '/','[[:punct:]]','') = regexp_replace(? || '/','[[:punct:]]','')", numProcess, NHibernateUtil.String));
                return criteria.UniqueResult<Process>();
            }
            catch (Exception e)
            {
                throw new Exception(e.ToString());
            }
        }

Line 111 is in return criteria.UniqueResult <Process> ();
 
Does anybody know how to solve this?