Thread:Extension talk:Validator/Class RangeValidator not found

Hi,

a fatal error comes up when I execute a simple ask query such as :

Fatal error: Class '\ValueValidators\RangeValidator' not found in ...\extensions\Validator\includes\ParamDefinitionFactory.php on line 176

The following extensions are installed:
 * MediaWiki 1.19.3
 * PHP 5.3.0 (apache2handler)
 * Semantic MediaWiki (Version 1.9 alpha)
 * DataTypes (Version 0.1 alpha)
 * DataValues (Version 0.1 alpha)
 * ValueFormatters (Version 0.1 alpha)
 * ValueParsers (Version 0.1 alpha)
 * ValueValidators (Version 0.1 alpha)
 * Validator (ParamProcessor) (Version 1.0 alpha)

Cheers, Basil