What is the meaning of the error message "Cannot index a string using a string" in jq?

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The error message "Cannot index a string using a string" in jq means that you are trying to index a string using another string, which is not allowed in jq. This error typically occurs when you are trying to use a string as an index to access a value in an object or array, but the value you are trying to access is actually a string itself. To fix this error, you need to make sure that you are using the correct index type (number or string) for the data structure you are working with.