Queueing :: Error When Create Sub-consult With DBLink Between 3 Instances

I have 3 instances and i want to work between then. The error occurs when i use subquery, This is the code:

update erie.rie_cbtrega@l$e_tfcries rgr
set rgr.c_descri = ( select rg.c_descri
from dadm.cbtrega@l$e_tfccie rg
where rg.c_idrega = rgr.c_idrega
)
;

When i execute update without subquery "( select rg.c_descri from dadm.cbtrega@l$e_tfccie rg where rg.c_idrega = rgr.c_idrega)" the result is successfully, but when i add subquery the result is

ORA-02019: no se ha encontrado la descripción de la conexión para la base de datos remota
ORA-02063: line precediendo a TFCCIE
ORA-02063: 2 lines precediendo a L$E_TFCRIES