How do i fix out of memory issues

Unity Engine
1

Hi i just tryed to run my game in the editor and i got an out of memory error what is there avalible to increse unitys max memory etc
here is a printscreen of my error
1291843--59276--$error.png

2

This will happen with KGFMap if you try to create textures at too high a resolution on a large terrain. It has to have all those textures in memory, and it will blow up. Go into properties, and under “its Photo”, change “itsPixelPerMeter” to a lower value, like 1, or maybe even lower.

3

Thanks is the only other way to make a map that high quality for it would be to have a saved version?
Or is there some other tricks to improve the quality?