PHP Fatal error

you will get such an error if the php_intl.dll extension is not enabled.

You need to enabled it in php.in file something like
extension=ext/php_intl.dllNumberFormatter is part of intl extension bundled with PHP since PHP 5.3 (2009): http://php.net/manual/en/class.numberformatter.php
If you are using a version older than that you should definitely upgrade. Please note that everything prior to PHP 5.6 is currently considered old and unsupported by the developers of PHP. There are no security releases for older versions.

And if you are running a multi-language site it makes sense to have the internationalization extension enabled..

Also the formatting feature can be turned off from the Settings page, ie: /wp-admin/options-general.php?page=hyyan-wpi under Features, Use locale number formats.

This is also discussed on: https://ww.wp.xz.cn/support/topic/update-to-1-0-2-breaks-site/

this is resolved now in any case with 1.0.3 release