Cloudformation unable to delete stack - role is invalid or cannot be assumed

Reason for this error is because the role used by cloudformation is not available or deleted. Therefore Cloudformation can't use it to do its work. 

Solution is documented here:-

 https://repost.aws/knowledge-center/cloudformation-role-arn-error

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The specified initialization vector (IV) does not match the block size for this algorithm

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If you're getting  exception when trying to assigned key to a symmetric key and getting error message below :- The specified initialization vector (IV) does not match the block size for this algorithm And your code probably look like something below :- Then you need to go into debug mode and start looking into the supported size for IV as shown in diagram below :- As you can see, IV is 16 bytes, so you need to provide 16 bytes. The same goes for Key field too, if you're adding anything to it. As long as you provide a valid key size, then we're good and you're code will be ready.
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