为什么谷歌应用引擎抛出服务器错误

Question

错误：服务器错误

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我的google appengine在部署后抛出此错误。当我在本地测试它时工作正常。版本高于15但我删除了旧版本，现在只有2个版本。但我仍然得到同样的错误。我该怎样做才能使我的发动机工作？请帮忙。

日志

{
    httpRequest: {"status":  500},
    insertId: "5a0ffcb500011a4129d76be9",
    labels: {
        clone_id: "00c61b117c7f4bcf62b687c18a5e5cfdc5dca0ce0d2548d2e5ea797a1dd1d0e4f55478a746f842"   
    },
    logName: "projects/xxxxxx/logs/appengine.googleapis.com%2Frequest_log",
    operation: {
        first: true,
        id: "5a0ffcb200ff014bb267654c030001737e716f74692d37343133300001323031373131313874313433323033000100",
        last: true,
        producer: "appengine.googleapis.com/request_id",
    },
    protoPayload: {
        @type: "type.googleapis.com/google.appengine.logging.v1.RequestLog",
        appEngineRelease:  "1.9.54",
        appId: "s~xxx-xxxxx", 
        endTime: "2017-11-18T09:26:12.345119Z",
        finished: true,
        first: true,
        host: "xxxx-xxxx.appspot.com",
        httpVersion:"HTTP/1.1",
        instanceId: "00c61b117c7f4bcf62b687c18a5e5cfdc5dca0ce0d2548d2e5ea797a1dd1d0e4f55478a746f842",
        instanceIndex:  -1,
        ip: "122.xxx.xx.xxx",
        latency: "2.260205s",
        method: "POST",
        pendingTime:  "2.237488746s",
        requestId:  "5a0ffcb200ff014bb267654c030001737e716f74692d37343133300001323031373131313874313433323033000100",
        resource:  "/reports/standardReport",
        startTime:  "2017-11-18T09:26:10.084914Z",
        status:  500,
        urlMapEntry:  "main.app",
        userAgent:  "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.75 Safari/537.36",
        versionId:  "20171118t143203",
    },
    receiveTimestamp:  "2017-11-18T09:26:13.075858035Z",
    resource: {
        labels: {
            module_id:  "default",
            project_id:  "xxxx-xxxx",
            version_id:  "20171118t143203",
            zone:  "us12",
        },
        type:  "gae_app",
    },
    timestamp:  "2017-11-18T09:26:10.084914Z",
}

的app.yaml

runtime: python27
api_version: 1.0
threadsafe: true

handlers:
- url: /.*
  script: main.app

libraries:
- name: webapp2
  version: latest
- name: pycrypto
  version: latest
- name: ssl
  version: latest

default_expiration: "30d"

automatic_scaling:
  max_idle_instances: 1
  min_idle_instances: 1 # can be set to 0 for check
  max_concurrent_requests: 40 # can go upto 80
  min_pending_latency: 30ms #default value