xml_rpc-32700 error

I get this error
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Your Jetpack has a glitch. Something went wrong that’s never supposed to happen. Guess you’re just lucky: xml_rpc-32700
Try connecting again.

Detaily chyby: The Jetpack server could not communicate with your site’s XML-RPC URL. Please check to make sure https://artedance.cz/xmlrpc.php is working properly. It should show ‘XML?RPC server accepts POST requests only.’ on a line by itself when viewed in a browser and should not have any blank links or extra output anywhere.
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I have seen other heaving the same problem, i dont have any “spaces” there, see https://www.artedance.cz/xmlrpc.php

I tried also editing load.php, no use…