Error creating sharded partitioned table

Step 1). Create users for spider to connect to backend servers.

ssh root@maria-shard1
mysql -p
CREATE USER 'spider_user'@'10.4.21.7' IDENTIFIED BY 'spider';
GRANT ALL ON test.* TO 'spider_user'@'10.4.21.7';
FLUSH PRIVILEGES;

ssh root@maria-shard2
mysql -p
CREATE USER 'spider_user'@'10.4.21.7' IDENTIFIED BY 'spider';
GRANT ALL ON test.* TO 'spider_user'@'10.4.21.7';
FLUSH PRIVILEGES;

Step 2.) Verfify connections from the spider node (maria-dba).

mysql -u spider_user -p -h 10.4.21.76 test
mysql -u spider_user -p -h 10.4.21.77 test

Step 3) Define server entries on the spider node (maria-dba).

CREATE SERVER shard1 FOREIGN DATA WRAPPER MYSQL OPTIONS
(host '10.4.21.76', database 'test', user 'spider_user', password 'spider', port 3306);

CREATE SERVER shard2 FOREIGN DATA WRAPPER MYSQL OPTIONS
(host '10.4.21.77', database 'test', user 'spider_user', password 'spider', port 3306);

4.) Create Partitioned table on spider node (maria-dba);

CREATE TABLE opportunities (
id int(10) unsigned NOT NULL AUTO_INCREMENT,
k int(10) unsigned NOT NULL DEFAULT '0',
name varchar(128),
owner varchar(7),
amount decimal(10,2),
closeDate date,
stageName varchar(11) NOT NULL DEFAULT '',
primary key (id),
key k (k)
) engine=spider COMMENT='wrapper "mysql", table "opportunities"'
PARTITION BY KEY (id)
(
PARTITION pt1 COMMENT = 'srv "shard1"',
PARTITION pt2 COMMENT = 'srv "shard2"'
) ;

*ERROR 1062 (23000): Duplicate entry 'test-opportunities#P#pt1-0' for key 'PRIMARY'*