Error while trying to upload my plugin to katalon Store

I created Plugin jar for custom keyword.I zip this and try to submit to Katalon Store, it shows error - Invalid Plugin package. What else needs to be done after creating a jar using gradle. Pls explain

Hi @abirami,

Please send your package to store@katalon.com for us to check the file. We will inform you whether there is an issue as soon as it has been checked.

Thank you.

Cheers,

Katalon Store team