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When I did the extension updating error message appears as follows:

Warning: in_array() expects parameter 2 to be array, null given in system\modules\core\library\Contao\System.php on line 140
#0...

Yes, Intl is active.

Internationalization support: enabled
version: 1.1.0
ICU version: 57.1
ICU Data version: 57.1

Contao 4.2 already installed now.

Thank you very much for your help.

Thank you for your answers.
I've tried to change the PHP settings as follows:

extension=php_intl.dll

intl.default_locale = 0
intl.error_level = E_WARNING
intl.use_exceptions = 0

but the...

I usually have no problem to install Contao 3.x until 3.5.17, on my local PC using XAMPP and PHP Version 5.6.24. Right now i want to install Contao 4.2.4, and then comes the problem after entering...