Error 404 import file CSV Espocrm

[dandesignex]

Dear, I have problem importing CSV files in the espocrm, it is not possible to import due to error 404 not found.

In F12 it appears:

jquery-2.1.4.min.js: 4 POST https://www.thonet.cl/crm/api/v1/Imp...ion/uploadFile 404
send @ jquery-2.1.4.min.js: 4
ajax @ jquery-2.1.4.min.js: 4
next @ VM328: 420
click button [data-action = "next"] @ VM328: 42
dispatch @ jquery-2.1.4.min.js: 3
r.handle @ jquery-2.1.4.min.js: 3

How can I solve this problem?