error with cloudlfare activation on ls-cache with openlitespeed 1.6.15

#1
What produces this error?¿ my cloudflare.cls.php archive is here: cloudflare.cls.php

Fatal error: Uncaught Error: Call to undefined function LiteSpeed\CDN\curl_init() in /usr/local/lsws/develop8/html/wp-content/plugins/litespeed-cache/src/cdn/cloudflare.cls.php:232 Stack trace: #0 /usr/local/lsws/develop8/html/wp-content/plugins/litespeed-cache/src/cdn/cloudflare.cls.php(185): LiteSpeed\CDN\Cloudflare->_cloudflare_call('https://api.clo...', 'GET', false, false) #1 /usr/local/lsws/develop8/html/wp-content/plugins/litespeed-cache/src/cdn/cloudflare.cls.php(45): LiteSpeed\CDN\Cloudflare->_fetch_zone() #2 /usr/local/lsws/develop8/html/wp-content/plugins/litespeed-cache/src/conf.cls.php(544): LiteSpeed\CDN\Cloudflare::try_refresh_zone() #3 /usr/local/lsws/develop8/html/wp-content/plugins/litespeed-cache/src/admin-settings.cls.php(266): LiteSpeed\Conf->update_confs(Array) #4 /usr/local/lsws/develop8/html/wp-content/plugins/litespeed-cache/src/admin.cls.php(122): LiteSpeed\Admin_Settings->save(Array) #5 /usr/local/lsws/develop8/html/wp-content/plugins/litespeed-cache/src/admin.cls.php(76): LiteSpeed\Admin->_proc in /usr/local/lsws/develop8/html/wp-content/plugins/litespeed-cache/src/cdn/cloudflare.cls.php on line 232
 
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