Postgresql - pg_dump - no matching schemas were found

Question

I'm trying to create a backup from PostgreSQL database, but getting the following error: pg_dump: No matching schemas were found

I'm logged in as root and running the command

pg_dump -f db.dump --format=plain --schema=existing_schema --username=userx --host=localhost databasename

1. I logged in with userx to psql and tried \dt - this gave me information, that schema with name existing_schema is public.
2. I checked \l to see that databasename is the database name.
3. Password is correct, otherwise I could not access psql.
4. Localhost is correct, checked from running processes. Tried the ip-address of the server also, but in this case pg_admin gave an error about the host address.

Output of \dl:

 
                  List of relations

Schema |                Name                 | Type  | Owner
--------+-------------------------------------+-------+-------
 public | existing_schema                    | table | userx

Answer 1

You can try with back slash and double quote as metioned here.

sudo -u postgres pg_dump -v Database_Name -t "\"Table_Name\""