Inserting data into the bank gives the error "duplicate key value violates uniqueness constraint"

I tried to insert the data, but it gives the Duplicate value of the key violates the uniqueness constraint . I've already put all the primary and secondary keys.

Error MSG:

  

rg.postgresql.util.PSQLException: ERROR: Duplicate Viola key value   the uniqueness constraint "user_key" at   org.postgresql.core.v3.Executive QueryImpl.receiveErrorResponse (QueryExecutorImpl.java:2455)   at   org.postgresql.core.v3.QueryExecutorImpl.processResults (QueryExecutorImpl.java:2155)   at   org.postgresql.core.v3.ExecutiveImpl.execute Query (QueryExecutorImpl.java:288)   at   org.postgresql.jdbc.PgStatement.executeInternal (PgStatement.java:430)   at org.postgresql.jdbc.PgStatement.execute (PgStatement.java:356) at   org.postgresql.jdbc.PgStatement.executeWithFlags (PgStatement.java:303)   at   org.postgresql.jdbc.PgStatement.executeCachedSql (PgStatement.java:289)   at   org.postgresql.jdbc.PgStatement.executeWithFlags (PgStatement.java:266)   at org.postgresql.jdbc.PgStatement.executeUpdate (PgStatement.java:246)   at insercaoBD.main (insercaoBD.java:45)

CREATE TABLE public.usuario (
    login varchar(100) NOT NULL,
    nome_clo varchar(100) NOT NULL,
    cidade_natal varchar(100) NOT NULL,
    PRIMARY KEY (login)
);


CREATE TABLE public.bloqueados (
    p1 varchar(100) NOT NULL,
    p2 varchar(100) NOT NULL,
    motivos varchar(100) NOT NULL,
  b1 varchar(100) NOT NULL,
    PRIMARY KEY (p1, p2, motivos)
);


CREATE TABLE public.conhece (
    c01 varchar(100) NOT NULL,
    co2 varchar(100) NOT NULL,
    PRIMARY KEY (c01, co2)
);


CREATE TABLE public.gosta (
    login_g varchar(100) NOT NULL,
    rating integer NOT NULL,
    uri varchar(100) NOT NULL,
    PRIMARY KEY (login_g)
);


CREATE TABLE public.artista_musical (
    id integer NOT NULL,
    nome_artista varchar(100) NOT NULL,
    pais varchar(100) NOT NULL,
    genero varchar(100) NOT NULL,
    PRIMARY KEY (id)
);


CREATE TABLE public.cantor (
    c1 integer NOT NULL,
    c2 integer NOT NULL,
    PRIMARY KEY (c1, c2)
);


CREATE TABLE public.banda (
    b1 integer NOT NULL,
    PRIMARY KEY (b1)
);


CREATE TABLE public.musico (
    id integer NOT NULL,
    nome varchar(100) NOT NULL,
    estilo varchar(100) NOT NULL,
    d_nasc date NOT NULL,
    PRIMARY KEY (id)
);


CREATE TABLE public.categoria (
    nome_cat varchar(100) NOT NULL,
    PRIMARY KEY (nome_cat)
);




CREATE TABLE public.subcategoria (
    s1 varchar(100) NOT NULL,
    PRIMARY KEY (s1)
);


CREATE TABLE public.filme (
    nome varchar(100) NOT NULL,
    id integer NOT NULL,
    dt_lan date NOT NULL,
    PRIMARY KEY (id)
);


CREATE TABLE public.diretor_ (
    id integer NOT NULL,
    tel varchar(100) NOT NULL,
    endereco varchar(100) NOT NULL
);


CREATE TABLE public.ator_ (
    id integer NOT NULL,
    tel varchar(100) NOT NULL,
    endereco varchar(100) NOT NULL
);


CREATE TABLE public.gostaf (
    login_gf varchar(100) NOT NULL,
    rating integer NOT NULL,
    uri varchar(100) NOT NULL,
    PRIMARY KEY (login_gf)
);


CREATE TABLE public.bandapossuimusico (
    idb integer NOT NULL,
    idm integer NOT NULL
);

CREATE INDEX index_idb ON public.bandapossuimusico
    (idb);
CREATE INDEX index_idm ON public.bandapossuimusico
    (idm);


ALTER TABLE public.bloqueados ADD CONSTRAINT FK_bloqueados__p1 FOREIGN KEY (p1) REFERENCES public.usuario(login);

ALTER TABLE public.bloqueados ADD CONSTRAINT FK_bloqueados__p2 FOREIGN KEY (p2) REFERENCES public.usuario(login);

ALTER TABLE public.conhece ADD CONSTRAINT FK_conhece__c01 FOREIGN KEY (c01) REFERENCES public.usuario(login);

ALTER TABLE public.conhece ADD CONSTRAINT FK_conhece__co2 FOREIGN KEY (co2) REFERENCES public.usuario(login);

ALTER TABLE public.gosta ADD CONSTRAINT FK_gosta__login_g FOREIGN KEY (login_g) REFERENCES public.usuario(login);

ALTER TABLE public.cantor ADD CONSTRAINT FK_cantor__c1 FOREIGN KEY (c1) REFERENCES public.artista_musical(id);

ALTER TABLE public.cantor ADD CONSTRAINT FK_cantor__c2 FOREIGN KEY (c2) REFERENCES public.artista_musical(id);

ALTER TABLE public.banda ADD CONSTRAINT FK_banda__b1 FOREIGN KEY (b1) REFERENCES public.artista_musical(id);

ALTER TABLE public.subcategoria ADD CONSTRAINT FK_subcategoria__s1 FOREIGN KEY (s1) REFERENCES public.categoria(nome_cat);

ALTER TABLE public.gostaf ADD CONSTRAINT FK_gostaf__login_gf FOREIGN KEY (login_gf) REFERENCES public.usuario(login);

ALTER TABLE public.bandapossuimusico ADD CONSTRAINT FK_bandapossuimusico__idb FOREIGN KEY (idb) REFERENCES public.banda(b1);

ALTER TABLE public.bandapossuimusico ADD CONSTRAINT FK_bandapossuimusico__idm FOREIGN KEY (idm) REFERENCES public.musico(id);