Custom Command in Splunk

Splunk Search

I have created a python script and it is taking an argument . I have declared it ,like this`

hash = Option(
        doc='''
        **Syntax:** **ioc=***<fieldname>*
        **Description:** Name of the field which contains the hash''',
        require=True, validate=validators.Fieldname())`

No when I call the command "|command hash="1223333" from search, it is throwing "A value for *** command option hash is required". How to resolve the error?

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