Error 3926 , Server Failed To Resume Transaction

In a high load asp.net environment,  I am getting an error. 
The transation active in this session has been committed  or aborted by another session.
Here is the code , I am getting error. 1 object returnObject = null;
2 SqlTransaction sqlTrans = null;
3 try
4 {
5 //Getting new SqlConnection
6 comm.Connection = GetConnection();
7 //Opening connection
8 OpenConn(comm.Connection);
9 //beginning transaction
10 sqlTrans = comm.Connection.BeginTransaction( IsolationLevel.ReadCommitted );
11 //setting transaction to SqlCommand object
12 comm.Transaction = sqlTrans;
13 //executing operation
14 returnObject = comm.ExecuteScalar();
15 //trying to commit.
16 sqlTrans.Commit();
17
18
19 }
20 catch (SqlException sex)
21 {
22 if (sqlTrans != null)
23 {
24 sqlTrans.Rollback();
25 }
26 }
27 finally
28 {
29 comm.Connection.Close();
30 }
  Could you please explain , am I doing smthg wrong ?