Warning: Interpolation-only expressions are deprecated
on main.tf line 3, in provider "aws":
3: region = "${var.region}"
I also got the above warning, which is due to the changed syntax for declaring variables in terraform.
See the example below -:
Old syntax– region = “${var.region}” # you will get Interpolation-only warning
New Synatx– region = var.region # no warning
Check the syntax and correct it using any code editor.