В целевой внешней таблице "employes" нет ограничения уникальности, соответствующего данным ключам

CREATE TABLE Employes
(
    idEmployee INTEGER PRIMARY KEY,
    fullnameEmployee VARCHAR(200),
    positionEmployee VARCHAR(100)
);
 
CREATE TABLE Admins
(
    idEmployee INTEGER,
    fullnameAdmin VARCHAR(200) REFERENCES Employes(fullnameEmployee),
    incomeThisMonthAdmin NUMERIC(8,2),
    quantityShiftsWorkedAdmin INTEGER,
    phoneNumberAdmin NUMERIC(12),
    emailAdmin VARCHAR(100),
    FOREIGN KEY (idEmployee) REFERENCES Employes(idEmployee),
    CONSTRAINT idEmployee_pk PRIMARY KEY (idEmployee) 
);

CREATE TABLE Employes
(
idEmployee INTEGER NOT NULL,
fullnameEmployee VARCHAR(200),
positionEmployee VARCHAR(100)
);
ALTER TABLE Employes ADD CONSTRAINT chk_pk_id_emp PRIMARY KEY (idEmployee);
CREATE TABLE Admins
(
idEmployee INTEGER,
-- fullnameAdmin VARCHAR(200), <- это бред
--  REFERENCES Employes(fullnameEmployee), <- это тоже
incomeThisMonthAdmin NUMERIC(8,2),
quantityShiftsWorkedAdmin INTEGER,
phoneNumberAdmin NUMERIC(12),
emailAdmin VARCHAR(100)
);
ALTER TABLE Admins ADD CONSTRAINT chk_fk_id_emp FOREIGN KEY (idEmployee) REFERENCES Employes(idEmployee);

CREATE UNIQUE INDEX IF NOT EXISTS  idx_unq_admins_fullnm ON Admins USING btree(fullnameAdmin);

CREATE UNIQUE INDEX IF NOT EXISTS  idx_unq_Employes_fullnm ON Employes USING btree(fullnameEmployee);