Error handling

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syntax = "proto3";
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package userservice.v1;
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service UserService {
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  rpc CreateUser(CreateUserRequest) returns (User) {
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    option (x_fern_error_handling) = '{
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      "ALREADY_EXISTS": {
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        "error_name": "UserAlreadyExistsError",
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        "user_friendly_message": "A user with this email already exists"
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      },
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      "INVALID_ARGUMENT": {
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        "error_name": "ValidationError",
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        "user_friendly_message": "Please check your input and try again"
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      },
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      "RESOURCE_EXHAUSTED": {
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        "error_name": "RateLimitError",
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        "retry_after_seconds": 60
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      }
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    }';
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  }
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}