Session | KeyError: storage_scenario in API Posted May 7 · Report reply I'd like to report here , for other users which might find similar issues, the root cause which has been resolved through the internal ticketing system. Here the full reply from our developer: Quote The key error is because the JSON blob with which the server responds is used as the error message when the ServerError is raised. When displaying that error, we call the format() method on the error message string. Since it's a JSON blob, the braces are interpreted as replacement fields, so format() expects keys to have a key-value pair for the first word inside the first braces in the server response, which is "storage_scenario". This is erroneous. we are looking now on how to properly fix this for an upcoming api release.