erro no hammer

hlcsg: Error: Entity 0, Brush 58: ORIGIN brushes not allowed in world
(did you forget to tie this origin brush to a rotating entity?)

hlcsg: Error: Brush type not allowed in world
Description: The map has a problem which must be fixed
Howto Fix: Check the file http://www.zhlt.info/common-mapping-problems.htmlfor a detailed explanation of this problem