Unable to associate WAF

[tarekw]

When all the infrastructure is created for the first time, it is unable to associate WAF to the API Gateway resource as it can't find it. Running it second time round works fine.

Serverless: Packaging service...
Serverless: Excluding development dependencies...
Serverless: Creating Stack...
Serverless: Checking Stack create progress...
........
Serverless: Stack create finished...
Serverless: Uploading CloudFormation file to S3...
Serverless: Uploading artifacts...
Serverless: Uploading service xxxx-yyyy.zip file to S3 (26.99 MB)...
Serverless: Validating template...
Serverless: Updating Stack...
Serverless: Checking Stack update progress...
.......................................
Serverless: Stack update finished...
Service Information
service: xxxx-yyyy
stage: dev
region: eu-west-1
stack: xxxx-yyyy-dev
resources: 14
api keys:
  None
endpoints:
  POST - https://xxxxx
  GET - https://xxxxx
functions:
  xxxx: xxxx
layers:
  None
Serverless: Associating WAF...

-------- Associate WAF Error --------
AWS WAF couldn’t retrieve the resource that you requested. Retry your request.