Tilda Addon Not Working, How To?

I have completed the payment to use the api.
But in cs-cart, the css of the Tilta page is not connected.
The php error log is as follows:
[26-Aug-2022 11:58:19 Asia/Seoul] PHP Warning: math: illegal characters in /home/xxx/public_html/app/lib/vendor/smarty/smarty/libs/plugins/function.math.php on line 76
PHP Deprecated: The behavior of unparenthesized expressions containing both '.' and '+'/'-' will change in PHP 8: '+'/'-' will take a higher precedence in /home/xxx/public_html/app/addons/sd_pusher/lib/Pusher.php on line 118

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