I am getting an error ' Failed to generate Preview' in my report, I cannot see that I have done anything wrong

I am up to Subreport 22- Could there be a timeout issue?

Below is what the browser shows

main.31195303.chunk.js:1 Job failed. Job quit without result.

E @ main.31195303.chunk.js:1

main.31195303.chunk.js:1 Uncaught (in promise) Error: Job failed.

at E (main.31195303.chunk.js:1)

at WebSocket.a.onmessage (main.31195303.chunk.js:1)

main.31195303.chunk.js:1 Object

main.31195303.chunk.js:1 Job failed. Job quit without result.

E @ main.31195303.chunk.js:1

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