This is a generic error page which should help you in general with errors of this type. Refer below to the specific examples for more precise advice.

How to fix: Required attribute "X" not specified

Most Likely Cause and Fix

Your markup is lacking the X attribute on an element referred to by the relevant line and column number.

This attribute is required, it must not be omitted.

What This Error Means

There is a defined set of attributes for each HTML element. Some are required for your markup to be considered valid.

You have omitted the required X attribute on an element that requires it.

How To Fix It

The specific error message you encountered will refer to a line and column number. This will guide you to the exact point in your markup to which the error relates.

In general

Find the relevant element and add the missing X attribute.

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