Sudden receipt and error while deploying Dart application in GAE

Question

I deployed two times today to a different version (web3 and serverclient), and then suddenly I keep getting this error:

Could not start serving the given version.

DEBUG: Received error code [1] while running: [appcfg.py --application=arista-de
v --called_by_gcloud --noisy --oauth2 --oauth2_credential_file=C:\Users\Cristian
 Garcia\AppData\Roaming\gcloud\legacy_credentials\[e-mail]\singlest
ore.json --skip_sdk_update_check --version=clientserver --module=default update
C:\Users\Cristian Garcia\Documents\Dart\cloudsamples\clientserver\appengine_gene
rated_None_default_clientserver.yaml]

DEBUG: (gcloud.preview.app.deploy) Command failed with error code [1]
Traceback (most recent call last):
  File "C:\Program Files\Google\Cloud SDK\google-cloud-sdk\bin\..\./lib\googlecl
oudsdk\calliope\backend.py", line 928, in Run
    result = command_instance.Run(args)
  File "C:\Program Files\Google\Cloud SDK\google-cloud-sdk\bin\..\./lib\googlecl
oudsdk\calliope\exceptions.py", line 78, in TryFunc
    return func(*args, **kwargs)
  File "C:\Program Files\Google\Cloud SDK\google-cloud-sdk\lib\googlecloudsdk\ap
pengine\app_commands\deploy.py", line 154, in Run
    self.__Run(args, project, deployables)
  File "C:\Program Files\Google\Cloud SDK\google-cloud-sdk\lib\googlecloudsdk\ap
pengine\app_commands\deploy.py", line 208, in __Run
    runner.Run('update', appyaml, module=module)
  File "C:\Program Files\Google\Cloud SDK\google-cloud-sdk\bin\..\./lib\googlecl
oudsdk\appengine\lib\appengine_adapter.py", line 294, in Run
    raise AppcfgExecutionError(error_code, argv)
ToolException: Command failed with error code [1]
ERROR: (gcloud.preview.app.deploy) Command failed with error code [1]

Now I can’t deploy any Dart project to any of the old versions or even create new versions! (I do not know that I have several versions with different projects, this is good, but I'm just testing). I'm completely stuck !!!

EDIT

It was probably a mistake. Fixed after a couple of hours.