Warning with firefox using grid
I'm testing evaluation grid before buy it.
I made a grid with only four rows and twenty columns but I have a lot of warnings in Firefox with this message "reference to undefined property this[this._controller[i][name]" in the file "aw.js' line 30. The move of the horizontal scroll bar is very slow. And Firefox is always like it's still connected to something, it permanently "runs".
What is the problem?