Bad value $ for attribute id on element ul: An ID must not be the empty string

Rule from html under compatibility category

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You have set in empty id attribute on an ul element, which is not valid according to the W3C spec.

ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").

How do I fix this ?

Either remove the empty id attribute, if it is not needed for linking/scripting purposes, or set a valid value. If the id is generated server-size, try to only print it out conditionally (only if a valid value is set).

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