UNIBASIC developers please help me

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I am new to Unibasic technology .
-Please give me an example for opening a sequential file(.csv)
-Then to write a data into that sequential file.
I know that i have to use OPENSEQ for opening a sequential file and WRITESEQ for writing a sequential file. but i dont know were and how these commands can be used.

Here is my Code:

****************************************
*     INCLUDE DICT AND OPEN FILE       *
****************************************
OPEN:
$INCLUDE BP MENUSTRUCTURE.DICT
OPEN '','MENULIST' TO MENULIST ELSE    
PRINT 'DATABASE FILE NOT FOUND'
END
OPENSEQ '','SAVEX.CSV' TO SAVEX ELSE
PRINT 'OPENSEQ FAILED'
END
RETURN
****************************************
*	      LIST FILE 	       *
****************************************
LIST:
CMD = 'SELECT MENULIST'
EXECUTE CMD CAPTURING JUNK
66
N=0
LOOP
  READNEXT ID ELSE EXIT
   MATREAD D.MENULIST FROM MENULIST,ID  THEN 
   N=N+1
   END
REPEAT
PRINT N
FOR ID=0 TO N
   MATREAD D.MENULIST FROM MENULIST,ID  THEN
    I=0
    GOSUB PRINT.DATA:
   END
NEXT ID

RETURN
****************************************
*	      PRINT DATA 	       *
****************************************
PRINT.DATA:
IF MENULIST.MENU_LINK_NO=I THEN
   MLN=  MENULIST.MENU_NO
   PRINT  MENULIST.MENU_NAME
   WRITESEQ MENULIST.MENU_NAME TO SAVEX THEN *This part I am hitting an Error.
   END ELSE 
   PRINT "WIRTE FAILED"
   END
   PRINT  STR('-',30)

 
   FOR SID=0 TO N
       MATREAD D.MENULIST FROM MENULIST,SID  THEN
 
                GOSUB PRINT.SUBMENU
          
       END
   NEXT SID


END ELSE
END
  RETURN

I have also created SAVEX.CSV (CREATE.FILE SAVEX.CSV)
But I dont know why i am getting the error..