Crockpot Fruity Cake

1-21 ounce can of apple or cherry pie filling
1 yellow cake mix
1/2 cup of melted butter
1/2 cup of your choice of chopped nuts

Pour pie filling in crockpot. Combine cake mix and butter until crumbly. Sprinkle over pie filling. Top with nuts. Cover and cook on low for 2 to 3 hours.