it seems some validator is configured/made that field required through field configuration on create step, due to this it is giving error message
That's not really a question. It's also telling you what is wrong.
Whatever you have configured to create the issue is not giving Jira the data you've flagged as mandatory for the custom fields it requires. You either need to remove the mandatory flag, or change your process so that it provides the missing data.
Can you please help me how to delete the cusom field
how to delete the custom field?
Do you mean make it optional, or actually delete the entire field?
you go to the customfield in field configuration of your project and click as Optional.
see https://confluence.atlassian.com/display/JIRA/Specifying+Field+Behavior#SpecifyingFieldBehavior-Makingafieldrequiredoroptional
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