Hi,
These are not errors, but warnings, coming from the uGui package from the Ecosystem. So you are fine with this, as what it says some properties are obsolete.
I will be releasing new updates of all them Ecosystem Packages tested and cleaned up for 5.3+.
For the other warning on CheckIfdirty, have you re saved it, and does it goes away, or is it recurrent even after you saved the scene?
Bye,
Jean