Cloudflare WP plugin cannot be completed even if it is applied.

I installed the Cloudflare WP plugin. It cannot be completed even if it is applied. Environment is WordPress 6.2.2 with DB 53496 on PHP 7.4.3-4ubuntu2.18. If you have any other information needed to receive support, please reply.

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in the console
I’m getting multiple errors.
/rec/wp-admin/admin-ajax.php?action=cloudflare_proxy:1

Failed to load resource: the server responded with a status of 501 ()

/rec/wp-admin/option…=cloudflare#/home:1

Uncaught SyntaxError: Unexpected token ‘T’, “This metho”… is not valid JSON
at JSON.parse ()
at Object.callback (compiled.js?ver=4.12.0:15:1834)
at compiled.js?ver=4.12.0:54:57512
at g.callback (compiled.js?ver=4.12.0:54:63989)
at g. (compiled.js?ver=4.12.0:54:60804)
at r.emit (compiled.js?ver=4.12.0:54:67409)
at n.onreadystatechange (compiled.js?ver=4.12.0:54:64844)

When I open the URL of the error on the screen with a browser, it is displayed like this.

URL opened
rec/wp-admin/admin-ajax.php?action=cloudflare_proxy


Notice: Undefined index: proxyURLType in /var/www/html/www.mydomain.jp/rec/wp-content/plugins/cloudflare/src/WordPress/Proxy.php line 86

Notice: Undefined index: proxyURLType in /var/www/html/www.mydomain.jp/rec/wp-content/plugins/cloudflare/src/WordPress/Proxy.php line 88

Failed to load resource: the server responded with a status of 501 ()
/rec/wp-admin/option…=cloudflare#/home:1 Uncaught SyntaxError: Unexpected token ‘T’, “This metho”… is not valid JSON
at JSON.parse ()
at Object.callback (compiled.js?ver=4.12.0:15:1834)
at compiled.js?ver=4.12.0:54:57512
at g.callback (compiled.js?ver=4.12.0:54:63989)
at g. (compiled.js?ver=4.12.0:54:60804)
at r.emit (compiled.js?ver=4.12.0:54:67409)
at n.onreadystatechange (compiled.js?ver=4.12.0:54:64844)

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