What is wrong here?

The following function returns this error:

pg_query(): Query failed: ERROR:  permission denied for relation customers
CONTEXT:  PL/pgSQL function "newprofile" line 8 at SQL statement

What is wrong here?


CREATE SEQUENCE CustomerID;
CREATE TABLE Customers
(
  CustomerID INTEGER NOT NULL DEFAULT nextval('CustomerID'),
  IsActive BOOLEAN NOT NULL DEFAULT TRUE,
  Email VARCHAR(64) NOT NULL CHECK (Email = substring(Email from
'^.+@.+\..+$')),
  Password VARCHAR(15) NOT NULL CHECK (Password = substring(Password from
'^[0-9_A-Za-z]{5,15}$')),
  FullName VARCHAR(50) NOT NULL,
  Address VARCHAR(100) NOT NULL,
  Phone VARCHAR(15) NOT NULL,
  Created TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  Accessed TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,

  PRIMARY KEY (CustomerID),
  UNIQUE (Email)
);

CREATE FUNCTION NewProfile(VARCHAR, VARCHAR, VARCHAR, VARCHAR, VARCHAR)
RETURNS INTEGER AS '
DECLARE
  aEmail ALIAS FOR $1;
  aPassword ALIAS FOR $2;
  aName ALIAS FOR $3;
  aAddr ALIAS FOR $4;
  aPhone ALIAS FOR $5;
BEGIN
  INSERT INTO Customers(Email, Password, FullName, Address, Phone)
    VALUES(lower(aEmail), aPassword, aName, aAddr, aPhone);
  RETURN currval(''CustomerID'');
END;
' LANGUAGE plpgsql;

GRANT EXECUTE ON FUNCTION NewProfile(VARCHAR, VARCHAR, VARCHAR, VARCHAR,
VARCHAR) TO SomeCustomer;