Hello
Thank you for your reply, I’ve checked and seems your hosting is not supporting mbstring package, please make sure from your hosting provider that below packages is installed and working, so HelpUs will be working well.
PHP >= 7.1.3
OpenSSL PHP Extension
PDO PHP Extension
Mbstring PHP Extension
Tokenizer PHP Extension
XML PHP Extension
Ctype PHP Extension
JSON PHP Extension
BCMath PHP Extension
Best Regards