SQL & PL/SQL

Hi,
I am getting an error "numeric or value error " for the below code

PROCEDURE PRC_CREATE_TEMP_CLOB(pi_original_clob IN OUT NOCOPY CLOB) IS
		l_tmp_clob clob;
		BEGIN
			 dbms_lob.createtemporary(l_tmp_clob, TRUE, dbms_lob.session); 
			 XmlDom.writeToClob(domDocument,l_tmp_clob);
			 dbms_lob.write(pi_original_clob,dbms_lob.getlength(l_tmp_clob),1,l_tmp_clob);
		   		END;

The error comes in the statement "dbms_lob.write"

Any idea what can be the error?

Thanks