Following the sh script of test and meets the 'authentication error'

[mayzhou0401]

Hi
My testlink server version is 1.9.19.
I am using 'rest-api/v2/curl/keywords/createKeyword.sh' and testing my testlink restful API, but I get the 'authentication error'.
The following is what I am trying:
curl -X POST -u {myUsername}:{myPassword} -H "Content-Type: application/json" http://{server_ip}/lib/api/rest/v2/testplans/{plan_id}
Then I try to change {myPassword} to APIKEY, but also return 'authentication error'.
Can you please help? Thanks.