jquery.fileupload.js:87 Uncaught TypeError: $.widget is not a function

[Kiswono Prayogo]

I tried to use basic example, that I've included in my html:

jquery.js

bootstrap.css

bootstrap.js

jquery.fileupload.css

jquery.iframe-transport.js

jquery.fileupload.js

Is there anything else that I should include to properly use jquery-file-upload?

My page doesn't need to use jquery-ui, 

is jquery-ui a dependency to jquery-file-upload?

[Craig McKie]

jQuery-File-Upload requires the jquery.ui.widget.js file to work.

My website has these files in this order to allow the uploader to work:

jquery.min.js jquery.ui.widget.js jquery.iframe-transport.js jquery.fileupload.js