stack creation fails: "IPv6 rules can only be specified for VPC security.."

Question

Using facebook's new Conversion Api Gateway - I am trying to set up a cloudformation stack (I believe it's the facebook template that sets it up automatically for me) but I get "CREATE_FAILED" with the following error message:  
  
ipv6-ranges is not a valid parameter. IPv6 rules can only be specified for VPC security groups. (Service: AmazonEC2; Status Code: 400; Error Code: InvalidParameter; Request ID: db0e8b28-d345-4e12-8620-03b79a21b2c7; Proxy: null)  
  
I have tried creating a new (default) vpc with Amazon ipv6 support, but no luck.  
  
See screenshot link for details!

Answer

I tried with another region and it worked.  
  
So presumably some old settings of mine were causing this.  
  
I am marking this one as answered.

stack creation fails: &quot;IPv6 rules can only be specified for VPC security..&quot;

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stack creation fails: "IPv6 rules can only be specified for VPC security.."