Il y a eu une erreur 500

Network error: Unexpected token < in JSON at position 0

404 bus
Error: Network error: Unexpected token < in JSON at position 0
    at new ApolloError (/app/node_modules/apollo-client/bundle.umd.js:92:26)
    at /app/node_modules/apollo-client/bundle.umd.js:1588:34
    at /app/node_modules/apollo-client/bundle.umd.js:2008:15
    at Set.forEach (<anonymous>)
    at /app/node_modules/apollo-client/bundle.umd.js:2006:26
    at Map.forEach (<anonymous>)
    at QueryManager.broadcastQueries (/app/node_modules/apollo-client/bundle.umd.js:2004:20)
    at /app/node_modules/apollo-client/bundle.umd.js:1483:29
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
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