Damnit i hate this error, from time to time i get this and when i do i know i can’t fix it because i can delete or change whatever i want in the map the error still appears it’s just like it’s meant to be and god how mad i’m about this arggggh :x
So can somebody help me, i’ve looked for known solves but they don’t work for me.
Wow! There’s a lot of information over the forums! I’ve tell some stuff several times. So you should use more search. If you don’t find anything that helps really, you can send the map over to me.
If its not a origin that misses a model it can be bad brushes.
Try to select every brush from a close distance (so you are sure not to hit the bad ones) and hide them - then make a brush all over and try “select inside” and see if it comes up with something (you possibly wont see it in the main window but in the small window to the left - cant remember the name) - then delete it and unhide your brushes again.
That worked for me - was using the clipper tool and something went wrong.
You could try the brush cleanup - but ill guess you have tried that.
Good luck.
well I find it sometimes, when u delete a trigger it isn’t really deleted (sometimes I think), so press L and look in the list for a trigger without a brush, noramlly its on coordinate (0,0)
in the list it noramally sticks out like a sore thumb lots of trigger with brushes and then 1 without…
and then delete it, fixes the problem when it happens in my maps.
If you have teleporters you might notice it cause the trigger has 2 lines going form it 1 to the right location and another to the coordinates (0,0)
dude, i did what you said looked for a door rotating and found the trigger without a door, deleted it and voila 
thanks
yes, my friend also gets that problem all the time, thats why i know, and I had it in my first map, and threw it away because of frustration thanks to sv_ null
So now I don’t forget it anymore 
this happens if you have a brush entity and and change it’s type. Then prev type gets lost and goes to 0 0 coords. Select View > Entity list and look at entitys that have no down arrows. When you click on the entity at the entity list it selects on map. So when entity on 0 0 coords gets red, hit backspace and delete it :twisted: . Do this until the entity names gone from 0 0.
P.S. This is on Radiant 1.50 
Happy mapping
yes im getting that same error and i tryd both of ur suggestions but they didnt work…
hmmm theres many solutions here ill try em all and post back
edit: wow nothing works and i tryd twice… wat a waste of an hour
anyways its that map that came with the missing entitys packedge u found 4 me
see if anyone can debugg it http://www.megaupload.com/?d=V284LBAQ