i have a problem with the upfront

I have this error:
The specified value "!" does not conform to the required format. The format is "#rrggbb" where rr, gg, bb are two-digit hexadecimal numbers.
http://powermarketing.es/wp-content/themes/upfront/elements/upfront-slider/tpls/uslider.html Failed to load resource: the server responded with a status of 500 (Internal Server Error)
require.js:32 Uncaught Error: http://powermarketing.es/wp-content/themes/upfront/elements/upfront-slider/tpls/uslider.html HTTP status: 500
http://powermarketing.es/wp-content/themes/upfront/elements/upfront-slider/tpls/backend.html Failed to load resource: the server responded with a status of 500 (Internal Server Error)
require.js:32 Uncaught Error: http://powermarketing.es/wp-content/themes/upfront/elements/upfront-slider/tpls/backend.html HTTP status: 500

I see that the http://powermarketing.es/wp-content/themes/upfront/elements/upfront-slider/tpls/ is wrong because the correct url is
http://powermarketing.es/wp-content/themes/upfront/elements/upfront-slider/tpl/