This indicates that the patches to Sage did not apply successfully.  Can 

> you check those?
>

thanks for your replies!

the error message has gone after reimporting the patches and building sage. 
Nevertheless, I still don't get the cell running:

1. The device seems to be starting somehow:

 stumpc5@stumpc5:~/progs/sage-5.0.rc0/devel/sagecell$ sage 
./start_device.py 
Executing:  /home/stumpc5/progs/sage-5.0.rc0/sage  -python trusted_db.py  
--untrusted-mem -1  --workers 5  --quiet ''  --untrusted-account 
'localhost'  --untrusted-python '/home/stumpc5/progs/sage-5.0.rc0/sage  
-python'  --untrusted-cpu -1 
PID:  6773
/usr/bin/ssh: 
/home/stumpc5/progs/sage-5.0.rc0/local/lib/libcrypto.so.1.0.0: no version 
information available (required by /usr/bin/ssh)
stumpc5@localhost's password: 
SSH process id:  6929
ssh: /home/stumpc5/progs/sage-5.0.rc0/local/lib/libcrypto.so.1.0.0: no 
version information available (required by ssh)
Pseudo-terminal will not be allocated because stdin is not a terminal.
stumpc5@localhost's password: 
Permission denied, please try again.
stumpc5@localhost's password: 
Welcome to Ubuntu 12.04 LTS (GNU/Linux 3.2.0-24-generic x86_64)

 * Documentation:  https://help.ubuntu.com/

PROCESS GROUP ID:  7104

-------------------------------------------------------------------------------

2. The server as well

stumpc5@stumpc5:~/progs/sage-5.0.rc0/devel/sagecell$ sage ./start_web.py 
Executing:  /home/stumpc5/progs/sage-5.0.rc0/sage  -twistd -n web --wsgi 
web_server.app --port 8080 
2012-05-10 16:30:59+0200 [-] Log opened.
2012-05-10 16:30:59+0200 [-] twistd 12.0.0 
(/home/stumpc5/progs/sage-5.0.rc0/local/bin/python 2.7.2) starting up.
2012-05-10 16:30:59+0200 [-] reactor class: 
twisted.internet.pollreactor.PollReactor.
2012-05-10 16:30:59+0200 [-] Site starting on 8080
2012-05-10 16:30:59+0200 [-] Starting factory <twisted.web.server.Site 
instance at 0x221eea8>

-------------------------------------------------------------------------------

But when I try to compute 1+1, I get this message in the server terminal

1336660297.76:         : Retrieved messages: []
2012-05-10 16:31:37+0200 [-] 127.0.0.1 - - [10/May/2012:14:31:37 +0000] 
"GET 
/output_poll?computation_id=242b2ec6-062b-49c2-bf13-2522c6605564&sequence=0&rand=0.18678609952491598
 
HTTP/1.1" 200 2 "http://localhost:8080/"; "Mozilla/5.0 (X11; Ubuntu; Linux 
x86_64; rv:12.0) Gecko/20100101 Firefox/12.0"

again and again.

Thanks, Christian

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