so we checked your blank page and looks like you have outdated PHP version on your server because your current server does not work with array_replace_recursive() which was added since version 5.3 but the Wordpress itself requires minimum 5.6 version what about you can read on https://wordpress.org/about/requirements/
No, it has nothing to theme so we appreciate if you could not try to affirm us in something what is so obvious for us. If you really think that it's theme, you definitely supposed to contact with your web developer so maybe he would be able to explain it better to you.
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Comments
so we checked your blank page and looks like you have outdated PHP version on your server because your current server does not work with array_replace_recursive() which was added since version 5.3 but the Wordpress itself requires minimum 5.6 version what about you can read on https://wordpress.org/about/requirements/
Thanks!
P.S. We suggest to check http://themeart.co/question/fatal-error-call-to-undefined-function-array_replace_recursive/ where this has been explained as well. Hope that you will understand that the server you use IS NOT Wordpress ready.