Valid Hatch Boundary Not Found

[Jean]

I am using AutoCad 2004 and when I try to hatch (solid) some will hatch and other walls will not. The steps I take are as follows:
Pick the hatch button, then the pattern and then, pick points. Some will hatch and others show at the cmmd line: analyzing data or 2000+ have been selected. Do you really want to do this ? (y) (n).

Can someone tell me what I am doing wrong or is it a drawing issue. Am working in the layout tab.

Many thanks,

Jean

[pennylove]

you aren't doing anything wrong. but the "Do you really want to do this ? (y) (n)" if you select y, then it will trace over all or most objects in your drawing and you really don't want to do that.

Instead, try isolating layers of whatever it is that you want to hatch. And then make your hatch areas into smaller sections, sometimes it helps to draw plines, and put them on a separate layer so that you can freeze it off, and thaw it if you need to rehatch something. This is the kind of weird thing that autocad likes to spaz on for no real reason. Sometimes it will act like this, and other times it is fine.

[fuccaro]

I have seen this error if parts of the hatch boundary are at different elevation. Also be sure that all the hatch boundary is visible on the screen when you start the HATCH command

[CyberAngel]

When I've had this problem, it's usually because the borders of the pick area are not closed. As pennylove suggested, you could draw a pline around the area and pick that object instead of trusting AutoCAD to find the right borders. The corners have to meet exactly, even if the gap is too small to see or measure. Otherwise the hatch "escapes" the area--that's usually when the "do you really" message appears.
If you're in a hurry and those little gaps don't matter, you can redefine the HPGAPTOL system variable so the Hatch command will ignore the gaps.