Upfront Builder and Editor is not loading

As the title says, Upfront Builder and Upfront Editor is not loading. Getting the following errors on console:

?editmode=true:46 GET http://warsztat.egryfice.pl/wp-content/themes/upfront/wp-content/themes/upf…tion/css/unewnavigation-style.min.css?ver=3228cf2d3dcd346489b4efb5c90b9e75
jquery-migrate.min.js?ver=1.4.1:2 JQMIGRATE: Migrate is installed, version 1.4.1
jquery.js?ver=1.12.4:3 The specified value "!" does not conform to the required format. The format is "#rrggbb" where rr, gg, bb are two-digit hexadecimal numbers.
ja @ jquery.js?ver=1.12.4:3
n.parseHTML @ jquery.js?ver=1.12.4:4
a.fn.init @ jquery-migrate.min.js?ver=1.4.1:2
n @ jquery.js?ver=1.12.4:2
(anonymous) @ main.js:73
(anonymous) @ main.js:73
(anonymous) @ main.js:73
main.js:51 GET http://warsztat.egryfice.pl/wp-content/themes/upfront/wp-content/themes/upfront/elements/upfront-contact-form/templates/ucontact.html?ufver=1.8 404 ()
node.c.env.c.env.undefined.process.versions.process.versions.node.xhr.c.env.c.env.e.createXhr.e.get @ main.js:51
load @ main.js:51
(anonymous) @ require.js:21
(anonymous) @ require.js:8
s @ require.js:12
callPlugin @ require.js:19
fetch @ require.js:17
check @ require.js:19
enable @ require.js:22
enable @ require.js:27
(anonymous) @ require.js:22
(anonymous) @ require.js:8
x @ require.js:7
enable @ require.js:21
init @ require.js:16
(anonymous) @ require.js:26
require.js:32 Uncaught Error: http://warsztat.egryfice.pl/wp-content/themes/upfront/wp-content/themes/upfront/elements/upfront-contact-form/templates/ucontact.html?ufver=1.8 HTTP status: 404
at XMLHttpRequest.o.onreadystatechange (main.js:51)
o.onreadystatechange @ main.js:51
require.js:33 GET http://warsztat.egryfice.pl/wp-content/themes/upfront/wp-content/themes/upfront/elements/upfront-maps/js/ContextMenu.js?ufver=1.8
l.load @ require.js:33
load @ require.js:28
load @ require.js:17
fetch @ require.js:17
check @ require.js:19
enable @ require.js:22
enable @ require.js:27
(anonymous) @ require.js:22
(anonymous) @ require.js:8
x @ require.js:7
enable @ require.js:21
enable @ require.js:27
(anonymous) @ require.js:22
(anonymous) @ require.js:8
x @ require.js:7
enable @ require.js:21
init @ require.js:16
(anonymous) @ require.js:26
require.js:8 Uncaught Error: Script error
http://requirejs.org/docs/errors.html#scripterror
at J (require.js:8)
at HTMLScriptElement.onScriptError (require.js:29)
J @ require.js:8
onScriptError @ require.js:29
jquery.min.js:2 Uncaught DOMException: Failed to read the 'contentDocument' property from 'HTMLIFrameElement': Blocked a frame with origin "http://warsztat.egryfice.pl" from accessing a cross-origin frame.
at contents (chrome-extension://laankejkbhbdhmipfmgcngdelahlfoji/core/vendor/jquery.min.js:2:5154)
at Function.map (chrome-extension://laankejkbhbdhmipfmgcngdelahlfoji/core/vendor/jquery.min.js:1:14862)
at ot.fn.init.ot.fn.(anonymous function) [as contents] (chrome-extension://laankejkbhbdhmipfmgcngdelahlfoji/core/vendor/jquery.min.js:2:5271)
at HTMLIFrameElement.eval (chrome-extension://laankejkbhbdhmipfmgcngdelahlfoji/components/ActivityMonitor/views/overlay/ActivityMonitorOverlayView.js:1:1894)
at Function.each (chrome-extension://laankejkbhbdhmipfmgcngdelahlfoji/core/vendor/jquery.min.js:1:14059)
at ot.fn.init.each (chrome-extension://laankejkbhbdhmipfmgcngdelahlfoji/core/vendor/jquery.min.js:1:11922)
at e.bindActivityDetectors (chrome-extension://laankejkbhbdhmipfmgcngdelahlfoji/components/ActivityMonitor/views/overlay/ActivityMonitorOverlayView.js:1:1853)
at e.init (chrome-extension://laankejkbhbdhmipfmgcngdelahlfoji/components/ActivityMonitor/ActivityMonitorController.js:1:255)
at onLoaded (chrome-extension://laankejkbhbdhmipfmgcngdelahlfoji/core/content.js:1:979)
at eval (chrome-extension://laankejkbhbdhmipfmgcngdelahlfoji/core/ComponentFactory.js:1:943)