Hi

To answer my own question, I passed the error message as a parameter in the url:

[ 	self insertNewUser.

	ZnResponse redirect: self request url ] on: TbDbError do: [ :err | | url |

	  url := (ZnUrl fromString: 'error/db_error/')

	    queryAt: 'msg' put: err messageText;

	    yourself.				

      ZnResponse redirect: url ]

Vince