How do I stop sprites from passing through one another?

Both sprites have attributes of "solid." Not sure what else to do to keep them from passing through one another.

I have uploaded by .capx file at https://www.dropbox.com/s/wu4kiat0hgw7i7r/RID.capx?dl=0. Thanks.

Solid alone is not enough, you have to use another behavior (I forget which one, but it is in the "Solid" description, I believe).

https://www.scirra.com/manual/104/solid -- looks like it is 8-direction or platform. So add 8-direction or platform to all of your objects too.

That worked! Thanks!