Unable to get the refarch working in EU location

I have made a (global) S3 bucket and copied the mobile-backend.template and the config-helper.template. Then I made another S3 bucket to hold the lambda-functions and copied the folder search/index.js, folder stream-handler/index.js, folder upload-note/index.js as well as files package.sh and upload.sh.

I created a cloud search domain, an api gateway and a cognito identity pool (federated) in my EU region.
I have checked and found all variables parameterized, except the constants.swift file which should not come into play before I start up the iOs demo?..

I started the cloud formation from the S3 bucket/mobile-backend.template.

These are the events in Test01 (name of the stack)

2016-06-20 Status Type Logical ID Status reason
15:21:14 UTC+0200 DELETE_COMPLETE AWS::DynamoDB::Table PhotoNotesTable
15:20:43 UTC+0200 DELETE_COMPLETE AWS::IAM::Role DynamoStreamHandlerRole
15:20:43 UTC+0200 DELETE_IN_PROGRESS AWS::DynamoDB::Table PhotoNotesTable
15:20:42 UTC+0200 DELETE_COMPLETE AWS::IAM::Role SearchApiRole
15:20:42 UTC+0200 DELETE_COMPLETE AWS::IAM::Role NotesApiRole
15:20:41 UTC+0200 DELETE_IN_PROGRESS AWS::IAM::Role DynamoStreamHandlerRole
15:20:41 UTC+0200 DELETE_COMPLETE AWS::IAM::Role MobileClientRole
15:20:41 UTC+0200 DELETE_IN_PROGRESS AWS::IAM::Role SearchApiRole
15:20:40 UTC+0200 DELETE_IN_PROGRESS AWS::IAM::Role NotesApiRole
15:20:40 UTC+0200 DELETE_IN_PROGRESS AWS::IAM::Role MobileClientRole
15:20:40 UTC+0200 DELETE_IN_PROGRESS AWS::CloudFront::Distribution CloudFrontDistribution
15:20:40 UTC+0200 DELETE_COMPLETE AWS::Lambda::Function DynamoStreamHandlerFunction
15:20:40 UTC+0200 DELETE_COMPLETE AWS::Lambda::Function SearchApiFunction
15:20:34 UTC+0200 ROLLBACK_IN_PROGRESS AWS::CloudFormation::Stack Test01 The following resource(s) failed to create: [MobileClientRole, SearchApiFunction, NotesApiRole, CloudFrontDistribution, DynamoStreamHandlerFunction]. . Rollback requested by user.
15:20:34 UTC+0200 CREATE_FAILED AWS::Lambda::Function DynamoStreamHandlerFunction 1 validation error detected: Value 'lambda-mobilebackend-cloudformation/lambda-functions' at 'code.s3Bucket' failed to satisfy constraint: Member must satisfy regular expression pattern: ^[0-9A-Za-z.-_]*(?