Problems with backup

Can anyone tell me how to solve this problem, please.

afa


bash$ pg_dumpall -o
psql: error in loading shared libraries: psql: undefined symbol:
pg_encoding_to_char
\connect template1
select datdba into table tmp_pg_shadow       from pg_database where datname
= 'template1';
delete from pg_shadow where usesysid <> tmp_pg_shadow.datdba;
drop table tmp_pg_shadow;
copy pg_shadow from stdin;
psql: error in loading shared libraries: psql: undefined symbol:
pg_encoding_to_char
\.
delete from pg_group;
copy pg_group from stdin;
psql: error in loading shared libraries: psql: undefined symbol:
pg_encoding_to_char
\.
psql: error in loading shared libraries: psql: undefined symbol:
pg_encoding_to_char
bash$