I can't change the background!

I can’t change the background for bottton , label ,screen…
This message appears as in the picture

Multiple times reported. This is known bug but yet to resolved by kodular. You should solve it manually. Export it as aia, open with 7zip , open project text file , there you start to delete the text starting from project color to just before the name of the aia, save it …then again import the aia into creator

Thank you so much Boban