Internal Server Error

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Error: Event does not exist - slide-bournemouth
    at /app/build/server.js:8343:31
    at step (/app/build/server.js:8314:23)
    at Object.next (/app/build/server.js:8295:53)
    at fulfilled (/app/build/server.js:8286:58)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)