[/Parameters/SubnetCountParam] ‘null’ values are not allowed in templates
Error message could be more helpful
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I got this error while adding a parameter to a template:
An error occurred (ValidationError) when calling the CreateChangeSet operation: [/Parameters/SubnetCountParam] ‘null’ values are not allowed in templates
Since I had just added a parameter, I presumed I was not setting the value correctly but I couldn’t find what I was missing. Finally I looked at the CloudFormation template and realized it looked like this:

Null was not referring to the value I was passing in, but rather the fact that the type was missing for the parameter. It seems quite obvious that this error message would be better if it said:
“Parameter SubnetCountParam is missing Type”
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Teri Radichel | © 2nd Sight Lab 2023
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