Syntax error

Hi, there.
I’m so happy to use your plugin, WP Fastest Cache.

Once I logged in my wordpress website, then I couldn’t see any problem.
But when I check the same page with different browser which means I don’t logged in,
I have a syntax error from the webpage.

Here is the message.

Parse error: syntax error, unexpected ‘version’ (T_STRING) in /host/home1/soominahn/html/wp-content/cache/all/index.html on line 100.

Can you explain what’s going on my website?
In case, I put my website info.

URL : soominahn.com
PHP Version : PHP 5.5
DB : MySQL 5.1

Thank you.

https://ww.wp.xz.cn/plugins/wp-fastest-cache/