How to handle numeric and value error in oracle Reports?

REP-300: PL/SQL: numeric or value error
ORA-06512: at "SYS.OWA_UTIL", line 356
ORA-06512: at "SYS.OWA_COOKIE", line 67
ORA-06512: at "SYS.OWA_COOKIE", line 183
ORA-06512: at "WWW_CLS.QSI_SESSION$", line 184
ORA-06512: at "WWW_CLS.QSI_SESSION$", line 273
ORA-06512: at "WWW_CLS.PERSON_NAME_PROCESS$", line 222
ORA-06512: at "WWW_CLS.STAFF$", line 1149
ORA-06512: at line 1
SELECT distinct cp . client_id , DECODE ( : i_report_type , 1 , prog . NAME || ' (' || prog . code || ')' , 2 , decode ( o . name , null , ' No Location' , o . NAME || ' (' || organization_code || ')' ) ) group_1 , INITCAP ( pc . last_name || ', ' ||