Help:Cite errors/Cite error ref too many keys

Overview
A footnote used multiple times may be defined with a name:
 * content

Any footnote can be assigned to a group:
 * content

Or both:
 * content

The ref name need not be placed within quotes unless it contains a space, certain punctuation marks, or non-ASCII characters. Specifically, quotes are not necessary if the name contains only printable ASCII characters excluding space, straight double quote ("), dollar sign ($), percent sign (%), straight single quote ('), plus sign (+), equals sign (=), backslash (\), and the greater-than sign (&gt;). With quotes, the only restriction is that the name may not contain the less-than sign (&lt;) or the quote character. The wiki parser converts single word quoteless attribute values into validly quoted XHTML. Note that any quotation marks placed around the ref name must be straight quotes (") rather than curly quotes (“ or ”).

Issues and resolution
A named reference tag has too many names or parameters. A quoteless name such as  will be parsed as two separate names due to the space, thus generating the error. You can only specify two parameters,  and. You can't, for instance, format a reference with content, or give it an id.

Examples
In this example, reference 1 is named, which is invalid due to the space. In reference 2  is valid as it is enclosed in quotes and reference 3 is valid as   uses an underscore.

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