Layout: from Encounter to Virtuoso

Hi! 

I'm a new user of the forums :)

This is the problem I have at the moment: 

I have a complete design in Encounter of a block called Pixel, and I want
to export it to cadence virtuoso. Reading on internet and the help,
I've seen that I have to export a GDSII file (basically, I can produce
2 file: the outputStream called pixel_output_stream and the Map file
streamOut.map).

In the Stream File field I specify the path to pixel_output_stream,
while I use the map file in the Layer tab that I can find clicking on
option (here I can upload the map file).

Obviously I specify even the tech library (cmrf8sf, Arti2009DM and
others).

then, I click Translate.

the final result is not
correct; I have this error:

ERROR (58): Failed to create the new layer purpose pair 'DIEAREA:ALL'.
It will be skipped and all the shapes on this LPP will be dropped.

I have this error 163 times, exactly the number of the Stream layer
that I can see when I upload the streamOut.map file.

The final result (in Virtuoso) is a design with correct shape and with
all the cells (flip-flop, etc...), but with no routing between cells
(but I did it in Encounter) and without supply and ground rings
(again, I did it in Encounter).

I received an answer in other forum, where they point out that the Encounter streamOut file is (more or less) like this:

E.g. of stream out file:
---------------------------------------------------------------------------

-----------------------------------------------------------------------------------
METAL1          NET                           1            0
METAL1          SPNET                      2            0
METAL1          PIN                         3              0
METAL1          LEFPIN                     4            0
METAL1          FILL                        5                0
METAL1          VIA                          6               0
METAL1          VIAFILL                    7              0
METAL1          LEFOBS                    8              0
NAME            METAL1/NET              9               0
NAME            METAL1/SPNET        10             0
NAME            METAL1/PIN              11              0
NAME            METAL1/LEFPIN         12            0
VIA12           FILL                              13            0
VIA12           VIA                              14             0
VIA12           VIAFILL                       15              0
--------------------------------------------------------------------------------------------------------------------------------------------------------------

Instead, the Virtuoso streamIn file is:

 E.g. of stream in file:
---------------------------------------------------------------------------

-----------------------------------------------------------------------------------
#Cadence Layer(M*foundry*)  Layer Purpose  Encounter Stream layer
Stream Datatype
   viap1                                        drawing         1,2,3                                0
   met1                                        drawing         4,5,6,7,8,9,10                   0
   met1I                                       drawing          11                                   0
   met1T                                      drawing           12,13,14,15                     0
   viam1                                       drawing         16,17,18                          0
--------------------------------------------------------------------------------------------------------------------------------------------------------------

"As you can see, some layers from Encounter were merged so they lose
functionality in Virtuoso. "

Questions: 

The last file, is a file that is provided with the technology libraries,
is something that should be generated by Encounter or Virtuoso, or is
something that I have to generate by myself following some rules? (in this case, which rules?)

Moreover: if I have these 2 map files, what file I need to specify in
XStream? If you go to CIW --> File --> Import --> Stream and click on
Option and then select tha Layout tab, here you can specify a map
file. At the moment I'm uploading the streamOut.map generated by
Encounter. Do I have to specify the other one (supposing I'll be able
to find it out)?

 Thanks in advance for help

 Francesco.