Class Mapping Error: 'T' must be a non-abstract type with a public parameterless constructor

While mapping class i am getting error 'T' must be a non-abstract type with a public parameterless constructor in order to use it as parameter 'T' in the generic type or method.

Below is my SqlReaderBase Class

 public abstract class SqlReaderBase<T> : ConnectionProvider
    {

        #region  Abstract Methods

        protected abstract string commandText { get; }
        protected abstract CommandType commandType { get; }
        protected abstract Collection<IDataParameter> GetParameters(IDbCommand command);
        **protected abstract MapperBase<T> GetMapper();**

        #endregion

        #region Non Abstract Methods

        /// <summary>
        /// Method to Execute Select Queries for Retrieveing List of Result
        /// </summary>
        /// <returns></returns>
        public Collection<T> ExecuteReader()
        {
            //Collection of Type on which Template is applied
            Collection<T> collection = new Collection<T>();

            // initializing connection
            using (IDbConnection connection = GetConnection())
            {
                try
                {
                    // creates command for sql operations
                    IDbCommand command = connection.CreateCommand();

                    // assign connection to command
                    command.Connection = connection;

                    // assign query
                    command.CommandText = commandText;

                    //state what type of query is used, text, table or Sp 
                    command.CommandType = commandType;

                    // retrieves parameter from IDataParameter Collection and assigns it to command object
                    foreach (IDataParameter param in GetParameters(command))
                        command.Parameters.Add(param);


                    // Establishes connection with database server
                    connectio