I'm missing something in this trigger defination, if I click the Check Syntax button I get a message that everything is OK, but when I click the apply button, I'm getting a message saying:

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Microsoft SQL-DMO (ODBC SQLState: 42S22)
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Error 2714: Invalid column name ' '.
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OK   
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Here is my tigger code I'm trying to put in.

CREATE TRIGGER [Audit_Update] ON dbo.meetings
  FOR UPDATE
AS
declare @tcAction varchar(500)
set @tcAction=" "

if update(begintime) or update(RoomID)
     begin
	if update(Begintime)
                            set @tcAction='Scheduled Time/Date Changed  '
	if Update(RoomID)
                            set @tcAction=@tcAction+'Room Changed'
	  INSERT INTO meeting_Audit (meetingnumber,begintime,endtime,patientID,roomid,actualRoomID,ScheduledBy,BlockMember,LastAuditForm,LastAuditBy)
                            (SELECT meetingnumber,begintime,endtime,patientID,roomid,actualRoomID,ScheduledBy,BlockMember,@tcAction,dbo.get_login_name()
		from deleted)
    end