I deactivated by mistake the jetpack plugin and after I reactivated it, this message appeared:
Your Jetpack has a glitch. Something went wrong that’s never supposed to happen. Guess you’re just lucky: xml_rpc-32601
Try connecting again. Error Details: The Jetpack server could not communicate with your site's XML-RPC URL. If you have the W3 Total Cache plugin installed, deactivate W3 Total Cache, try to Connect to WordPress.com again, reactivate W3 Total Cache, then clear W3 Total Cache's cache.
I didn't use the W3 Total Cache, I used Quick Cache plugin. I tried to deactivate the QC plugin but the jetpack still gave me this error.