Category:Pages using duplicate arguments in template calls

So you've likely gotten here by clicking on a strange Category that showed up near the bottom of the page. It's time to answer some things related to that.

Questions

What is this category for?

This category is for telling wiki users (mainly editors) that one of the templates used for the page accidentally has multiple arguments that use the same parameter name. In a way, seeing this category at the bottom of a page or in the category list at the bottom of this page means that something was incorrectly typed when using a template.

Why is this a category?

The category provides an accessible way to list pages or media with this duplicate argument error. Because nobody purposefully makes a list searching for this issue, the wiki automatically does it for its editors.

Indicators

It's unlikely that you reached this page without seeing at least one of these indicators. However, there are multiple places that indicate when this issue is present in a wiki page:

• This category is listed at the bottom of a page

• The preview when editing a page has an extra line indicating that a parameter has more than one value. This indicator is especially useful for determining which of the parameters have multiple values linked. For reference, this is a normal vs error preview contrast.

Resolving the issue

Usually, this is caused because of one of two reasons:

1. There is too many |'s in the template, causing one or more to map onto the same parameter in the template.
2. A parameter is defined twice.

To fix it, you need to check all of your template page arguments.The easiest way to figure out which one if multiple exist is if a part of the template's functionality is slightly off.

Example

The Minr Maps page had this error. Looking through the table of template rows, one noticeably sticks out:

Using this, we can pinpoint exactly which template has the issue in the editor. You can see in this instance how an extra | is added at the end, which is easy to miss due to the curly brackets. Deleting it solves the issue.