The requested resource [/birt-viewer-osgi/frameset] is not available

I am new to birt reporting tool. I am trying to setup birt rum time on

RockyLinux 8.8

BIRT Viewer Version: 4.9.0

BIRT Engine Version: 4.9.0

Java Version 11.0.19

welcome page displays fine but when I click on the view example link it shows an error like frameset is not available.

I have checked the required permissions on the folder and files.

when it tries to load the test.rptdesing file then the server is unable to find or fetch this file even though I checked and verified that the file is present in the folder.

prompt and quick response will be appreciated.