I have this error also in potter theme
post-new.php?post_type=acf-field-group:1077 Uncaught TypeError: acf.newPostbox is not a function
at post-new.php?post_type=acf-field-group:1077
(anonymous) @ post-new.php?post_type=acf-field-group:1077
post-new.php:1 Tracking Prevention blocked access to storage for https://secure.gravatar.com/avatar/ea17790c058df29d67c3a15207244f39?s=26&d=mm&r=g.
post-new.php?post_type=acf-field-group:1164 Uncaught TypeError: acf.newPostbox is not a function
at post-new.php?post_type=acf-field-group:1164
(anonymous) @ post-new.php?post_type=acf-field-group:1164
post-new.php?post_type=acf-field-group:3233 Uncaught TypeError: acf.doAction is not a function
at post-new.php?post_type=acf-field-group:3233
