paragraph restful api access denied

when I try to use paragraph restful api to post a paragraph, I get an error

said
drupal site:
Type access denied
Date Thursday, March 28, 2019 - 16:11
User admin
Location http://domain/entity/paragraph?_format=hal_json
Referrer
Message /entity/paragraph?_format=hal_json
Severity Warning

postman side:
body : {"type":[{"target_id":"two_columns"}],"field_twc_left_content":[{"value":"aa", "format":"full_html"}]}

result:
{
"message": ""
}