Excel Upload planning function error

Hi

I am implementing the excel upload functionality using planning function. I have completed all the steps mentioned in the How to BIIP File Upload and created the planning function and a planning sequence. However when I try to access the planning sequence through the web link - http://<server>:<port>/sap/bc/webdynpro/sap/zrsplf_file_upload?sap-client=100&sap-language=EN&planning_sequence=ZPSR50_03_01&show_messages=WEXA

it gives me error saying - The requested resource does not exist. I have tried various combinations with putting https:// instead of http://. I am pretty sure that the server and port is right.

Does anyone have any idea if this issue is caused by some configuration steps not outlined in the documentation?

Also the document talks about launching the excel upload functionality by choosing Web Dynpro Application -> Execute. The document says - "In order to launch the application, choose Web Dynpro Application -> Execute. This will bring up the file upload application in a web browser. The URL is displayed in the properties of the Web Dynpro application (see above)". Any idea what does this mean and how do I achieve it?