TIWFileUploader generates javascript error while dropping files on it

Hi,

I'm using IntraWeb 16.1.6 / Delphi 12.

A IWFileUploader generates the following javascript error when dropping files on it:

Uncaught TypeError: can't access property "maxFiles", this._options is undefined
    onDrop http://localhost:86/$/js/IWFileUploader__448109751.js:26
    _attachEvents http://localhost:86/$/js/IWFileUploader__448109751.js:37

Thanks in advance for your help.

Greetings from germany

Michael A.