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`rt=ec2.RouteTable('new-rt', vpc_id=vpc.id, routes=[{'gateway_id': igw.id, 'destination_cidr_block': '0.0.0.0/0'}])`

That wasn’t it. I’ll keep digging. Thanks. :slightly_smiling_face:

```aws:ec2:RouteTable (new-rt):
    error: aws:ec2/routeTable:RouteTable resource 'new-rt' has a problem: route.0: invalid or unknown key: destination_cidr_block

error: an error occurred while advancing the preview```