[Vue warn]: Error in created hook: "ReferenceError: param is not defined"

This error is occurring because there is a reference to a variable or parameter called `param` in the `created` hook of a Vue component, but it has not been defined or declared.

To fix this error, you need to make sure that the `param` variable or parameter is defined or declared before it is used in the `created` hook. Check the code carefully to see if there are any typos or missing declarations for this variable.