Hi Kuan,
Greetings from Syncfusion support.
We have validated your reported query, and we found that this issue will occur on web server, when we refer a local file path in the application, because this will allow end users to traverse back or even attack your server. You can resolve this FPD issue, by changing a configuration in the web server, that is, by disabling the "directory browsing", and the method for doing so depends on which web server you are utilizing. Please refer these instructions for Apache and IIS, which are two of the more popular web servers and also every web server will have documentation that describes how to configure this setting.
If you are facing this issue only when referring the ej2.min.js of our Syncfusion file, then we are also providing a CDN link for this ej2.min.js file, we suggest you to refer this CDN in your application instead of using the local file, so that you can overcome this problem.
Please get back to us if you have any queries.
Regards,
Ragunath S
