Google couldn't crawl your site because we were unable to access your site's robots.txt file

i use DNS of Cloudflare in my domain’s DNS but i have a robots.txt error in google webmaster.
when i type http://my site, show me the robot.txt without any problem but i dont know why i have error for fetching robots.txt in google webmaster. ( it has a little yellow icon below the robots.txt in google webmaster and it show me error tittle when my mouse is on it)
my robots.txt is like this right now:
User-agent: *
Disallow: /wp-admin/
Allow: /wp-admin/admin-ajax.php
Please help me. thanks.

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