generates error ORA-01460: unimplemented or unreasonable conversion requested

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sir,
generates error ORA-01460: unimplemented or unreasonable conversion requested.
When character size is more generate error like above.
the parameter type i used in my function ff_Save_Details as string
if any one knows the answer please help me..

ff_Save_Details( string as_REC_DETAILS)

OracleParameter P_REC_DETAILS = new OracleParameter("P_REC_DETAILS", OracleType.Clob);
                P_REC_DETAILS.Direction = ParameterDirection.Input;
                P_REC_DETAILS.Value = as_REC_DETAILS;