Not able to generate any output in BIRT

Hi all,

I am trying to generate multiple bar charts and output it as a single pptx.

This is an example of my flow and I am able to run it successfully in KNIME.

My flow name is simple and does not contain any special characters.

But when I tried to output my report in BIRT, I am not able to output anything (the export process seems to take infinity) and I am also not able to see the preview successfully.

I am not sure what had happened, need advice on this…

Thank you.