Non uniform scaling alert

[XDlolmaica]

I'm trying to put an object inside a folder/group, and an error called "Non uniform scaling alert" appears. It says:
"Nodes with non-uniform scale cannot have child nodes. Parent the non-uniform node with selected nodes at siblings under a group node as an alternative.

Here are some pics.

[Rinoa]

Select the folder and set its scale to (1, 1, 1).

[XDlolmaica]

Thanks!! It worked