I have been recently trying to create a new part for a humanoid robot. It looks something like this:

I created it using a boss extrude, defining the main oval shape, along with a cut extrude with the "flip-side to cut" setting

Now, I am trying to fillet the edges. It doesn't look like there is any problem, but I can't fillet the edges linked to the straight faces, as shown below.

Here are some of the error statements that I saw:

If I were to click FeatureXpert, my sketch could be filleted, however, this took an exorbitantly long time, and crashed my Solidworks and my computer many times. I have no idea what is the error. 

I have attached my file below. Any help is appreciated.