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Hi.
This error occurs due to a known bug where CloudFormation when dynamically references SSM parameters, it doesn't pick up the latest timestamp from SSM parameter store.
Here is the recommended workaround to resolve this issue:
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Recreate the SSM parameter.
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Get the new parameter timestamp using the command $aws ssm get-parameter --name ‘the name of the ssm parameter’. The timestamp is LastModifiedDate. You'll need to convert it to a Unix timestamp with milliseconds. You can do it by pasting the date here and copying the appropriate formatted value.
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Copy the processed template entirely and save it to a file (you'll have to edit and upload it later).
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Update the template file with the new SSM Parameter (correct the version and the timestamp for the ssm parameter)
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In your stack, click Update, choose "Replace current template", and "Upload a template file". Pick the new template file you've just corrected.
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Finish the wizard by clicking Next until the last step, and finally click Update stack.
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