The selected page 'Course_NewEdit' expects an object of type 'Course', which is not available here.

First let me state that I am brand new to Mendix and just going through the "Become a Rapid Developer 2018" course.  I have two questions which may or may not be related.  The first is in reference to  The first is in reference to a statement in unit 4 (https://gettingstarted.mendixcloud.com/link/module/82/lecture/689) on solving errors.  Step 6 indicates "Do you see that check box that says “Pre-fill page contents based on the Course entity”? You can use this functionality to create the page really fast, because it will generate an input widget for each attribute in the Course entity!". I am not able to find this checkbox when I create a new page from the button on my overview page.  Where would I find this?   The 2nd questions is related to an additional error I get and I am not sure if it is related to the fact that I could not find the checkbox above.  After following the steps of this lesson I am now getting an error that states "The selected page 'Course_NewEdit' expects an object of type 'Course', which is not available here." On the course overview page I have selected the new page "Course_NewEdit" on click.  This is where the error directs me.        On the Course_NewEdit page I selected Course as the Entity.  I am not clear what I am doing wrong here or how to solve this issue.