ORA-00942: table or view does not exist

Bonjour,

j'ai une erreur "ORA-00942: table or view does not exist " avec ma requete ci dessous:
portant ma table projet existe bien.

select count(*),def_category,def_customlist4,Bloquant, Majeur, Mineur from
(
select count(T1.id), T1.def_category ,T1.def_customlist4,T1.severity as Bloquant,0,0 from Defect T1,projet T9 where T1.def_pte_ref = T9.dbid and (T1.dbid <> 0 and ((T9.pte_name = 'TOTO_VFG'))) and T1.severity='1-Bloquant'
union
select count(T1.id),T1.def_category,T1.def_customlist4,0,T1.severity as Majeur,0 from Defect T1,projet_test T9 where T1.def_pte_ref = T9.dbid and (T1.dbid <> 0 and ((T9.pte_name = 'TOTO_VFG'))) and T1.severity='2-Majeur'
union
select count(T1.id),T1.def_category,T1.def_customlist4,0,0,T1.severity as Mineur from Defect T1,projet_test T9 where T1.def_pte_ref = T9.dbid and (T1.dbid <> 0 and ((T9.pte_name = 'TOTO_VFG'))) and T1.severity='3-Mineur'


);

Pouvez vous m'aider?
Mefci