Snappymail Error on Reverse Proxy

[abdiiwan]

i have config on htacces for reverse proxy snappymail,
RewriteEngine On
RewriteCond %{HTTPS} !=on
RewriteRule ^/?(.) https://%{SERVER_NAME}/$1 [R,L]
RewriteRule ^(.)$ http://cyberpanel/snappymail/$1 [P]
but if i try on url, show error:

An error occurred.
Please refresh the page and try again. Error: Failed loading
/snappymail/snappymail/v/2.15.3/static/js/min/libs.min.js

Please help!

[josephgodwinke]

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