GRANT question

Hi,
As a superuser I created a normal user:

CREATE USER probauser NOCREATEDB NOCREATEUSER;
ALTER GROUP eden_users ADD USER probauser;

a function:

CREATE OR REPLACE FUNCTION edenproc_usesysid(text)
RETURNS int4 AS .........
-- Note that the owner of this function is the superuser.

I added the EXECUTE grant for a function to the probauser:

GRANT EXECUTE ON FUNCTION edenproc_usesysid(text) TO probauser;

And then tried to run the function:

# select edenproc_usesysid('probauser');
ERROR: function edenproc_usesysid(text) does not exist
HINT: No function matches the given name and argument types. You may need
to add explicit type casts.

Certainly as the superuser I can run the function... What's missing more???

Thank you,
-- Csaba Együd

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