I am almost done with my map and when compiling for a test run i ran in to this error...

WARNING: PROBLEMS FOUND [Load with Error File in Radiant]
WARNING: Texture ($default) repeats more than once per inch. (x1)

i have only been using radiant for 2 weeks and this is my first error, how do i fix this . If anyone can help a noob map maker like me I would gratefully