Cannot open my diagram, web-based Camunda Platform 8

I’ve created a project and my first diagram within it.
Now I cannot open this diagram and got only the system message “Waiting for”.
What should I do next?
Thank you in advance!

Can you explain how you built the model exactly?
Also can you upload it here?

Hello Niall,

I’ve used drag-and-drop functionality of the platform, just modeling, no execution modules. How to explain this?

I cannot upload the model, as I cannot access it.

Probably, these console messagges will help:

Thank you in advance,

So you modeled this process in the Camunda Web Modeler?
Now when you try to open the model it causes an error?

Niall, yes, exactly.