Unable to Create AWS CloudFormation Stack with Template Two

The example doesn't generate Cloud Formation Stack and give the errors described below :
(Thank for the response in advance)

Location : US East
Template Two : https://s3.amazonaws.com/awslambda-reference-architectures/mobile-backend/lambdafunctions.template

Reported Errors : LambdaDynamoStreamsApiFunction Error occurred while getting the object from S3. S3 Error Code: NoSuchKey. S3 Error Message: The specified key does not exist.

LambdaMobileSearchApiFunction Error occurred while getting the object from S3. S3 Error Code: NoSuchKey. S3 Error Message: The specified key does not exist.

LambdaMobileCoreApiFunction Error occurred while getting the object from S3. S3 Error Code: NoSuchKey. S3 Error Message: The specified key does not exist.

Used Keys :
"LambdaSourceBucket": {
"Type": "String",
"Description": "Name of S3 bucket where Lambda function packages are stored.",
"Default": "awslambda-reference-architectures"
},

```
"LambdaMobileSearchS3Key": {
"Type": "String",
"Default": "mobile-backend/cloudsearchapi.zip",
"Description": "Name of S3 key for ZIP with Lambda function package for querying CloudSearch."
},
"LambdaNotesApiS3Key": {
"Type": "String",
"Default": "mobile-backend/photonotesapi.zip",
"Description": "Name of S3 key for ZIP with Lambda function package for sending mobile data to DDB."
},
"LambdaDynamoStreamsS3Key": {
"Type": "String",
"Default": "mobile-backend/searchstreams.zip",
"Description": "Name of S3 key for ZIP with Lambda function package for sending data to CloudSearch."
}
```

Commencez par Template Two à l’URL S3 indiquée et inspectez les références aux packages des fonctions Lambda, en particulier les valeurs LambdaMobileSearchS3Key, LambdaNotesApiS3Key et LambdaDynamoStreamsS3Key. Vérifiez que les objets référencés existent dans le bucket configuré et déterminez pourquoi CloudFormation signale NoSuchKey ; le travail est terminé lorsque le template peut créer la stack dans US East sans ces erreurs.

Rédigé par le modèle d'indexation à partir du texte de l'issue.