Help:Cite errors/Cite error ref no input

Overview
References are defined within  tags.

Issues and resolution
There is no content between the  tags. Either delete the two tags, or put content between them, for example:content; or, if you're reusing a named reference that's been defined elsewhere in the article use a single tag, for example

Examples
In this example, there is no content within the first set of  tags:

{{pre2| Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Curabitur pretium tincidunt lacus. Nulla gravida orci a odio. Nullam varius, turpis et commodo pharetra, est eros bibendum elit, nec luctus magna felis sollicitudin mauris. Integer in mauris eu nibh euismod gravida.