Error loading diagram preview while using excerpt macro for plantuml diagram

[Kazi Ashik-E-Ahad]

Hi, 

I am getting diagram loading error while I was trying to import one simple plantuml diagram to another page. Both the pages are in the same space.

I've tried deleting the excerpt, re-publishing the diagram and even tried with a new simplest one but still getting the same error.

Appreciate if anyone could guide me through the way forward.

Thanks in advance.