Contao 4.2.4 installation error

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 the install tool password information, an error appears as follows:

Fatal error: Call to undefined function Patchwork\grapheme_strlen() in C:\xampp\htdocs\mysite\vendor\patchwork\utf8\src\P atchwork\Utf8.php on line 234

What should I do? Anyone can help me?

Regards.

Heru

Your environment is missing the PHP intl extension. See

• https://github.com/contao/check/issues/95
• https://github.com/contao/check/pull/105

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 error message still remains as before.

Regards

Heru

Verify with

PHP Code:

---

<?php phpinfo();

---

that the PHP Intl Extension is active.

Quote:

---

Originally Posted by Spooky

Verify with

PHP Code:

---

<?php phpinfo();

---

that the PHP Intl Extension is active.

---

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.

Regards.

Heru