Recently the same problem happened to me, I just re-created my test environment, because for some reason I do not know what it was, it damaged my entire test environment, the detail is that if you try to make the background fixed on another page, the problem continues. Being that, if you open the project in firefox or Internet Explorer does not appear the error durane the creation of the project, only in google chrome. I entered the forum of both and I did not get an answer for solution, but as I had deadline to deliver the site, I did not wait for a solution from the manufacturer of the program.
Recently the same problem happened to me, I just re-created my test environment, because for some reason I do not know what it was, it damaged my entire test environment, the detail is that if you try to make the background fixed on another page, the problem continues. Being that, if you open the project in firefox or Internet Explorer does not appear the error durane the creation of the project, only in google chrome. I entered the forum of both and I did not get an answer for solution, but as I had deadline to deliver the site, I did not wait for a solution from the manufacturer of the program.