.xsession-errors grows too big

[xPol]

In a few hours, my .xsession-errors  file grows over 500 MB, until my /home 
partition is full. 
I am using opensuse 11.4  kde 4.6.1

That file appears filled in with lines from nepomuk, as follows:

: [OpenLink][Virtuoso iODBC Driver]CL064: Lost connection to server)"
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(10126)" Soprano: 
"SQLExecDirect failed on query 'sparql  ask where { { 
<nepomuk:/ctx/23eff521-b09b-4561-ad2b-f7a8109fd034> ?p1 ?o1 . } UNION { ?s2 
<nepomuk:/ctx/23eff521-b09b-4561-ad2b-f7a8109fd034> ?o2 . } UNION { ?s3 ?p3 
<nepomuk:/ctx/23eff521-b09b-4561-ad2b-f7a8109fd034> . } UNION { graph 
<nepomuk:/ctx/23eff521-b09b-4561-ad2b-f7a8109fd034> { ?s4 ?4 ?o4 . } . } }' 
(iODBC Error: [OpenLink][Virtuoso iODBC Driver]CL064: Lost connection to 
server)"
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(10126)" Soprano: 
"SQLExecDirect fail%     

klauncher(9772)/kio (KLauncher): SlavePool: No communication with slave. 

klauncher(9772)/kio (KLauncher): SlavePool: No communication with slave. 

[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(9818)" Soprano: 
"SQLExecDirect failed on query 'sparql  ask where { { 
<nepomuk:/ctx/0b9085ec-fb07-49d8-9fd7-bb993b0e2a46> ?p1 ?o1 . } UNION { ?s2 
<nepomuk:/ctx/0b9085ec-fb07-49d8-9fd7-bb993b0e2a46> ?o2 . } UNION { ?s3 ?p3 
<nepomuk:/ctx/0b9085ec-fb07-49d8-9fd7-bb993b0e2a46> . } UNION { graph 
<nepomuk:/ctx/0b9085ec-fb07-49d8-9fd7-bb993b0e2a46> { ?s4 ?4 ?o4 . } . } }' 
(iODBC Error: [OpenLink][Virtuoso iODBC Driver]CL064: Lost connection to 
server)"
[/usr/bin/nepomukservicestub] Query failed: "sparql  ask where { { 
<nepomuk:/ctx/0b9085ec-fb07-49d8-9fd7-bb993b0e2a46> ?p1 ?o1 . } UNION { ?s2 
<nepomuk:/ctx/0b9085ec-fb07-49d8-9fd7-bb993b0e2a46> ?o2 . } UNION { ?s3 ?p3 
<nepomuk:/ctx/0b9085ec-fb07-49d8-9fd7-bb993b0e2a46> . } UNION { graph 
<nepomuk:/ctx/0b9085ec-fb07-49d8-9fd7-bb993b0e2a46> { ?s4 ?4 ?o4 . } . } }"
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(9818)" Soprano: 
"SQLExecDirect failed on query '

Any suggestions?

Thank you 

---p