Krajee file-input widget 'upload' method throws exception

Question

I am using fileinput widget form krajee: http://plugins.krajee.com/file-input

What I am doing wrong using \'upload\' method ? When I upload files by pressing upload but

Answer 1

The answer is that I have older version of control (4.1.6) and documentation I have red is newer (4.1.7). In 4.1.6 upload method must have parameters, in 4.1.7 not In 4.1.6 the solution might be use uploadBatch which has no parameters (what I finally did)