Extension factory method is not callable

Hi, after updating to 2.3.7 my Texy extension stop working.

I get this error:

Nette\DI\ServiceCreationException

Factory ‘Texy\Texy::createTemplateHelpers’ used in service ‘texy.helpers’ is not callable. search►

config:

<?php
extensions:
 texy: Nette\Bridges\TexyDI\TexyExtension
?>

TexyExtensions: ..problem is on the line ..->setFactory($this->prefix(‘@texy') . '::createTemplateHelpers’)..

<?php
public function loadConfiguration()
	{
		$builder = $this->getContainerBuilder();
		$config = $this->getConfig($this->defaults);

		$this->validate($config, $this->defaults, $this->name);

		$builder->addDefinition($this->prefix('texy'))
			->setClass('Texy\Texy');

		Validators::assertField($config, 'safeMode', 'boolean');
		if ($config['safeMode']) {
			$builder->addDefinition($this->prefix('safeConfigurator'))
				->setClass('Texy\SafeConfigurator')
				->addTag($this->prefix('configurator'));
		}

		$builder->addDefinition($this->prefix('helpers'))
			->setClass('Texy\TemplateHelpers')
			->setFactory($this->prefix('@texy') . '::createTemplateHelpers')
			->setInject(FALSE);
	}
?>

and class Texy with not a callable method.

<?php
..
    /**
	 * @return \Texy\TemplateHelpers
	 */
	public function createTemplateHelpers()
	{
		return new TemplateHelpers($this);
	}
?>

It was working till the last upgrade of nette.