Autocomplete not working

Hi,

I’m using the 2.1.16 version of the plugin and I was able to run the plugin on this website http://paginas.ufsc.br.
On the other hand, when I try to put it on this other website, http://setic.ufsc.br, the plugin adds the classes “sa_searching” and “ui-autocomplete-loading”, but it doesn’t return any result and it remains with these classes forever. How can I fix this?

https://wordpress.org/plugins/search-autocomplete/