In the Python code, you should have something like this:
izSREvYl is the id of the managed folder. This is automatically inserted when you create a python recipe with an the managed folder as in input/output. Note that you can use the folder id or the folder name, and both are available in the recipe in the left panel of the recipe (inputs/outputs). Or, you can find the ID in the URL when you open the folder (https://myinstance/projects/PROJECT/managedfolder/izSREvYl/view/).
If you copy/paste code from a tutorial, make sure you update the ID.
Jeremy, Product Manager at Dataiku