Hi @Md Afzalur Rashid
The error that you get is mostly due to your site's API being Rate Limited.
You can refer to the below links for more info:
https://community.atlassian.com/t5/Jira-Service-Management/Re-Error-429-Too-Many-requests/qaq-p/2575183/comment-id/157291#M157291
https://community.atlassian.com/t5/Jira-Service-Management/Rate-Limit-Too-Many-Requests/qaq-p/1020846
Or: https://www.google.com/search?client=firefox-b-d&q=Jira+429+-+Too+many+requests, for a general view of the previous conversations.
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