A few months ago I wrote about this error that appears when someone is trying to install a module, extension or template design for previous Joomla versions. It's not the single time when this warning appears when trying you're trying to install or upgrade something.
Let's take for example the following code:
<?xml version="1.0" encoding="UTF-8"?>
<extension type="module" version="3.0" method="install">
<name>Joomla SlideShow</name>
<creationDate>2013-11-15</creationDate>
<author>Supravirtual SRL</author>
<copyright>(C) 2013 webdesign-software-code-seo.com. This module is released under the GNU/GPL v2 License</copyright>
<authorEmail>This email address is being protected from spambots. You need JavaScript enabled to view it. </authorEmail>
<authorUrl>http://www.webdesign-software-code-seo.com</authorUrl>
<version>1.0</version>
<description>Joomla horizontal and vertical Slideshow</description>
<license>http://www.gnu.org/licenseses/gpl-2.0.html GNU/GPL</license>
<files>....
The XML file continue with the rest of the necessary code for a module. The error what I am referring to appears when one is changing the "and" from description to "&". Everything else is OK, the code is OK, but you can't install or upgrade your Joomla extension as long as you are using & in the file.
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