i am building a beach map but when i try to run tool structure i keep on geting a reeor that goes like this

### ERROR vertex #0 has a bad point.

and i can not find the point to fix does anyone know how to fix this

if i helps i did try to follow this to add water to the map(this could be why)(and instead of putting !$ for the water i put !% for the water just like someone on this website told me(forget who))