[SOLVED]: "Notice: Use of undefined constant DS - assumed 'DS' in"

The DS constant has been removed in Joomla 3. If you really need it you can use DIRECTORY_SEPARATOR instead or insert the below code in your php file.

/* BEGIN: for joomla 3 projects */
JLoader::import( "joomla.version" );
$version = new JVersion();
if (!version_compare( $version->RELEASE, "2.5", "<=")) :
	if (!defined("DS")):
/* END: for joomla 3 projects */

Also there is a joomla plugin, named "DS Constant Plugin", to fix this issue.

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