@sarah988 wrote: hi!  I am still stuck on this question, I did everything but I still get an error in the log after submitting that storm_final does not exist.  can someone help me please thank you. Any time you want to ask about an error you need to do these 3 things: 1) Start your own thread on the forum, you can reference another thread such as this one by copying and paste the URL into your description 2) Copy the text of the code submitted that generated the error along with all the messages From the LOG. 3) On the forum open a text box in your problem description by clicking on the </> icon that appears above the message window and paste the copied text with the code and error messages.   The most common cause about things not existing is not following all of the step correctly in the set up instructions for your course.   Starting your own thread means that we do not have to wade through 2 year old stuff that doesn't apply directly to  your problem to find the your details. Plus as the author of the thread you have the ability to mark a solution, when made, as the correct solution. ... View more