Problem In Using Extension

Hi

i m trying to use the extension EchMultiSelect But on my form I am getting following error :

Alias "ext.EchMultiselect.EchMultiselect" is invalid. Make sure it points to an existing PHP file and the file is readable."

I also try to add following lines in my config/main.php


'import'=>array(

		'application.models.*',

		'application.components.*',

		'application.extensions.*',

	),

even then im getting same message, kindly guide

try giving your code like this


'import'=>array(

		'application.models.*',

		'application.components.*',

		'application.extensions.EchMultiselect.*',

	),

ever fix this? getting the same error!