I'm trying to API testing but error when run/send

Product Forums Katalon Studio
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Hi,

It seems like the error of the connection of API calling. I found these similar: maven - org.apache.http.conn.HttpHostConnectException: Connect to localhost:19538 [localhost/0:0:0:0:0:0:0:1] failed: Connection refused (Connection refused) - Stack Overflow and Plugin Store behind firewall - #6 by kellera50. Please try

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