Upfront not loading using Issue template

The upfront builder don't load and generates this errors:

http://wp-content/themes/upfront/wp-content/themes/upfront/elements/upfront-newnavigation/css/unewnavigation-style.min.css?ver=4.7.3 Failed to load resource: the server responded with a status of 404 ()
jquery-migrate.min.js:2 JQMIGRATE: Migrate is installed, version 1.4.1
jquery.js: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:3
ContextMenu.js Failed to load resource: the server responded with a status of 404 ()
require.js:32 Uncaught Error: Script error
http://requirejs.org/docs/errors.html#scripterror
    at J (require.js:8)
    at HTMLScriptElement.onScriptError (require.js:29)
http://wp-content/themes/upfront/wp-content/themes/upfront/elements/upfront-contact-form/templates/ucontact.html?ufver=1.8 Failed to load resource: the server responded with a status of 404 ()
require.js:32 Uncaught Error: http://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)
uf-issue Failed to load resource: the server responded with a status of 404 ()
unewnavigation-style.min.css Failed to load resource: the server responded with a status of 404 ()