bad response

Hi,

after jupiter theme update (tp6.4.1) and wp update to 5.3.2, i get a bad response message in loco….

in the console i get this but i am not skilled in php …

JQMIGRATE: Migrate is installed, version 1.4.1
admin.js?ver=2.3.1:104 Loco Error: Ajax failure for fsConnect
c.debug @ admin.js?ver=2.3.1:104
admin.js?ver=2.3.1:104 Rappelez le texte suivant lorsque vous signalerez un problème:
—-
Status 0 “Erreur inconnue” (text/html 0 bytes)
Blank response from server
====
/wp-admin/admin-ajax.php:1 Failed to load resource: net::ERR_HTTP2_PROTOCOL_ERROR

what to do?

thank you