First Cake Challenge-Chocolate Swiss Roll

From now on,i will treat every baking session as a challenge. My first cake challenge is Chocolate Swiss Roll with Chocolate Buttercream. The swiss roll turn out soft and chewy but the side cracks when i roll it.Another bad thing is my buttercream. I missed the key word "light and fluffy" when i beat the buttercream and directly apply the buttercream .It turns out very "liquid" when i apply it.So when i roll,the buttercream oozed out from the swiss roll. In order to save it,I quickly roll it and put into the fridge. I let it stay in the fridge for 45 minutes and luckily the buttercream did turn creamy.
Overall,the swiss roll was delicious.I feel happy but not satisfied as I will try another time to make it better.

For the swiss roll recipe,i adopt from here. & the recipe of chocolate buttercream is from here.