Thank you for replying.
I checked the logs, earlier and could not find the reason; gets Error Code 
204.
Here is the latest log entry.



19:15:44.624GET5000 B182 msChrome 53/
2604:2000:410f:1800:74da:b01f:2a14:8d3f - - [17/Oct/2016:19:15:44 -0400] 
"GET / HTTP/1.1" 500 - - "Mozilla/5.0 (X11; Linux x86_64) 
AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/53.0.2785.143 
Chrome/53.0.2785.143 Safari/537.36" "1.go-model.appspot.com" ms=182 
cpu_ms=0 cpm_usd=0 loading_request=1 
instance=00c61b117cd33cfbc5aca504be8b752ccc0db6da178f3ade65a0cd5aab05 
app_engine_release=1.9.46 trace_id=-
{
metadata: {
severity: "ERROR"  
projectId: "go-model"  
serviceName: "appengine.googleapis.com"  
zone: "us9"  
labels: {
appengine.googleapis.com/request_id: 
"58055ba000ff0988d68fd5abdc0001737e676f2d6d6f64656c000131000100"  
appengine.googleapis.com/module_id: "default"  
appengine.googleapis.com/version_id: "1"  
appengine.googleapis.com/clone_id: 
"00c61b117cd33cfbc5aca504be8b752ccc0db6da178f3ade65a0cd5aab05"  
}
timestamp: "2016-10-17T23:15:44.624854Z"  
}
protoPayload: {
@type: "type.googleapis.com/google.appengine.logging.v1.RequestLog"  
appId: "s~go-model"  
versionId: "1"  
requestId: "58055ba000ff0988d68fd5abdc0001737e676f2d6d6f64656c000131000100"  
ip: "2604:2000:410f:1800:74da:b01f:2a14:8d3f"  
startTime: "2016-10-17T23:15:44.624854Z"  
endTime: "2016-10-17T23:15:44.807514Z"  
latency: "0.182660s"  
method: "GET"  
resource: "/"  
httpVersion: "HTTP/1.1"  
status: 500  
userAgent: "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like 
Gecko) Ubuntu Chromium/53.0.2785.143 Chrome/53.0.2785.143 Safari/537.36"  
urlMapEntry: "_go_app"  
host: "1.go-model.appspot.com"  
wasLoadingRequest: true  
instanceIndex: -1  
instanceId: "00c61b117cd33cfbc5aca504be8b752ccc0db6da178f3ade65a0cd5aab05"  
line: [
0: {
time: "2016-10-17T23:15:44.807389Z"  
severity: "INFO"  
logMessage: "This request caused a new process to be started for your 
application, and thus caused your application code to be loaded for the 
first time. This request may thus take longer and use more CPU than a 
typical request for your application."  
}
1: {
time: "2016-10-17T23:15:44.807396Z"  
severity: "ERROR"  
logMessage: "A problem was encountered with the process that handled this 
request, causing it to exit. This is likely to cause a new process to be 
used for the next request to your application. (Error code 204)"  
}
]
appEngineRelease: "1.9.46"  
}
insertId: "2016-10-17|16:15:49.808763-07|10.106.211.193|1276045338"  
log: "appengine.googleapis.com/request_log"  
httpRequest: {
status: 500  
}
operation: {
id: "58055ba000ff0988d68fd5abdc0001737e676f2d6d6f64656c000131000100"  
producer: "appengine.googleapis.com/request_id"  
}
}
19:15:44.807This request caused a new process to be started for your 
application, and thus caused your application code to be loaded for the 
first time. This request may thus take longer and use more CPU than a 
typical request for your application.
19:15:44.807A problem was encountered with the process that handled this 
request, causing it to exit. This is likely to cause a new process to be 
used for the next request to your application. (Error code 204)

On Monday, October 17, 2016 at 6:17:20 PM UTC-4, Adam (Cloud Platform 
Support) wrote:
>
> Before doing any kind of changes to code, you'd want to check your logs 
> <https://cloud.google.com/logging/docs/view/logs_viewer> first, which 
> will often give a helpful stack trace to show where the error originated. 
> On a standard runtime instance you can view the request logs, and on a 
> flexible instance you can also view other logs like stderr, crash.log, and 
> vm.syslog which can help troubleshoot deployment errors.
>
> On Monday, October 17, 2016 at 4:00:27 PM UTC-4, Roger wrote:
>>
>> After uploading an app that was working before, this error results:*Error: 
>> Server Error*
>> *The server encountered an error and could not complete your request.*
>>
>> *Please try again in 30 seconds.*
>>
>>
>> To trace it down, I removed almost all code, and still get the error.
>>
>>
>> In the console, it says:  
>> *This app has no instances deployed.*
>>
>> Anyone can help?
>>
>

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