I try to start observer node and the api return error

Users Troubleshooting
1

I install the observer node on testnet38. When I call event API got this error
Request:
http://127.0.0.1:8071/v1/events?end_height=88941194&start_height=88941194&type=A.7e60df042a9c0868.FlowToken.TokensInitialized

Response:

{
“code”: 400,
“message”: “Invalid Flow request: failed to retrieve events from execution nodes [execution-48601e8a1568f18ca4a574a656710342857f939f598679280a6941cc7b800b6f@execution-003.devnet38.nodes.onflow.org:3569=100 execution-5f6c73a22445d7d958c6a37c1f3be99c72cacd39894a3e46d6647a9adb007b4d@execution-001.devnet38.nodes.onflow.org:3569=100 execution-a1f059a3e00347e585658e4c400be1580ba2e2f6d1f39387ad62e33f3f4d246d@execution-002.devnet38.nodes.onflow.org:3569=100]: 3 errors occurred:\n\t* rpc error: code = DeadlineExceeded desc = context deadline exceeded\n\t* rpc error: code = DeadlineExceeded desc = context deadline exceeded\n\t* rpc error: code = DeadlineExceeded desc = context deadline exceeded\n\n”
}