Can't use debugger

When I run sunstudio and I want to debug with Debug/Start Session/Run in debugger, I have the message "Exception occurred in Request Processor". If i show details, i have the messages :
Annotation: Exception occurred in Request Processor
java.lang.NullPointerException
     at org.netbeans.modules.debugger.delegator.DelegatingDebugger.addDebugger(DelegatingDebugger.java:376)
     at org.netbeans.modules.debugger.multisession.EnterpriseDebugger.addDebugger(EnterpriseDebugger.java:264)
     at org.netbeans.modules.debugger.multisession.EnterpriseDebugger.startDebugger(EnterpriseDebugger.java:213)
     at org.netbeans.modules.debugger.delegator.DefaultDebuggerType.startDebugger(DefaultDebuggerType.java:151)
     at org.netbeans.modules.debugger.support.ProcessDebuggerType.startDebugger(ProcessDebuggerType.java:234)
     at org.openide.debugger.DebuggerType.startDebugger(DebuggerType.java:64)
     at org.openide.loaders.ExecSupport.debug(ExecSupport.java:75)
     at org.netbeans.modules.debugger.support.actions.StartAction.performAction(StartAction.java:90)
     at org.openide.util.actions.NodeAction.performAction(NodeAction.java:184)
     at org.openide.util.actions.NodeAction.actionPerformed(NodeAction.java:175)
     at org.netbeans.core.ModuleActions$1.run(ModuleActions.java:97)
Could you help me ?

It's Sun Studio 11 and dbx runs fine from comman line
The last informations in the ide.log are :
Log Session: Monday, March 26, 2007 1:55:32 PM CEST
System Info:Product Version = Sun Studio 11 (Build 20050910)
IDE Versioning = IDE/1 spec=3.42.1 impl=20050910
Operating System = Linux version 2.6.9-22.0.2.ELsmp running on i386
Java; VM; Vendor = 1.4.2_13; Java HotSpot(TM) Client VM 1.4.2_13-b06; Sun Microsystems Inc.
Java Home = /opt/j2sdk1.4.2_13/jre
System Locale; Encod. = en_US (sunstudio); ISO-8859-1
Home Dir; Current Dir = /home1/thales/dsilva; /vobs/systemaLive
IDE Install; User Dir = /home/godel/netbeans/3.5V11; /home1/thales/dsilva/.sunstudio/11-Linux-i686
CLASSPATH = /home/godel/netbeans/3.5V11/lib/ext/boot.jar:/home/godel/netbeans/3.5V11/lib/ext/crimson-1.1.3
.jar:/home/godel/netbeans/3.5V11/lib/ext/regexp-1.2.jar:/home/godel/netbeans/3.5V11/lib/ext/xerces-2.0.2.jar:/home/godel
/netbeans/3.5V11/lib/ext/xml-apis-1.0b2.jar:/usr/java/lib/dt.jar:/usr/java/lib/htmlconverter.jar:/usr/java/lib/tools.jar
Boot & ext classpath = /home/godel/netbeans/3.5V11/modules/autoload/ext/jh-1.1.3.jar:/opt/j2sdk1.4.2_13/jre/lib/rt.ja
r:/opt/j2sdk1.4.2_13/jre/lib/i18n.jar:/opt/j2sdk1.4.2_13/jre/lib/sunrsasign.jar:/opt/j2sdk1.4.2_13/jre/lib/jsse.jar:/opt
/j2sdk1.4.2_13/jre/lib/jce.jar:/opt/j2sdk1.4.2_13/jre/lib/charsets.jar:/opt/j2sdk1.4.2_13/jre/classes:/opt/j2sdk1.4.2_13
/jre/lib/ext/ldapsec.jar:/opt/j2sdk1.4.2_13/jre/lib/ext/sunjce_provider.jar:/opt/j2sdk1.4.2_13/jre/lib/ext/dnsns.jar:/op
t/j2sdk1.4.2_13/jre/lib/ext/localedata.jar
Dynamic classpath = /home/godel/netbeans/3.5V11/lib/openide.jar:/home/godel/netbeans/3.5V11/lib/core-windows.jar:/
home/godel/netbeans/3.5V11/lib/core.jar:/home/godel/netbeans/3.5V11/lib/locale/core-windows_zh_CN.jar:/home/godel/netbea
ns/3.5V11/lib/locale/core-windows_ja.jar:/home/godel/netbeans/3.5V11/lib/locale/core_ja.jar:/home/godel/netbeans/3.5V11/
lib/locale/openide_ja.jar:/home/godel/netbeans/3.5V11/lib/locale/openide_zh_CN.jar:/home/godel/netbeans/3.5V11/lib/local
e/core_zh_CN.jar:/home/godel/sunstudio11/prod/lib/locale/openide_sunstudio.jar:/home/godel/sunstudio11/prod/lib/locale/c
ore_sunstudio.jar:/home/godel/sunstudio11/prod/lib/locale/core_sunstudio_ja.jar:/home/godel/sunstudio11/prod/lib/locale/
openide_sunstudio_ja.jar:/home/godel/sunstudio11/prod/lib/locale/core_sunstudio_zh_CN.jar:/home/godel/sunstudio11/prod/l
ib/locale/openide_sunstudio_zh_CN.jar:/home/godel/sunstudio11/prod/lib/locale/analyzer_st_zh_CN.jar:/home/godel/sunstudi
o11/prod/lib/locale/analyzer_st_ja.jar
Turning on modules:
org.openide/1 [3.42.1 20050910]
org.openide.src [1.0.1 20050910]
org.openide.io [1.0.1 20050910]
org.openide.execution [1.0.1 20050910]
org.openide.compiler [1.0.1 20050910]
org.netbeans.core/1 [1.12.1 20050910]
org.netbeans.lib.terminalemulator [1.0.1 20050910]
org.netbeans.core.output/1 [1.0.1 20050910]
org.netbeans.core.compiler/1 [1.3.1 20050910]
org.openide.debugger [1.0.1 20050829]
org.netbeans.modules.editor/1 [1.13.1 20050910]
org.netbeans.modules.diff/1 [1.6.1 20050910]
org.openidex.util/2 [2.6.1 20050910]
org.netbeans.modules.vcscore/1 [1.8.1 20050910]
org.netbeans.modules.cvsclient/1 [1.7.2 20050910]
org.netbeans.modules.javahelp/1 [1.2.1 20050910]
org.netbeans.core.execution/1 [1.2.1 20050910]
org.netbeans.modules.cpp/1 [1.4 2005/10/13]
org.netbeans.core.windows/1 [1.1.1 20050910]
org.netbeans.core.ui/1 [1.1.1 20050910]
org.netbeans.modules.externaleditor [1.4 20050910]
org.netbeans.modules.settings/1 [1.3.1]
org.netbeans.modules.utilities/1 [1.13.1 20050910]
com.sun.tools.swdev.toolscommon [1.15 ${buildnumber}]
org.netbeans.modules.autoupdate/1 [2.7.1 20050910]
org.netbeans.modules.debugger.core/3 [2.8.1 20050910]
com.sun.tools.swdev.sunstudio/1 [1.2 051013]
org.netbeans.core.ide/1 [1.2.1 20050910]
org.netbeans.modules.group/1 [0.1.1 20050910]
com.sun.tools.swdev.javadisabler/1 [1.2 051013]
org.netbeans.modules.vcs.advanced/1 [1.8.1 20050910]
com.sun.forte.st.mpmt/1 [8.2]
org.netbeans.modules.vcs.profiles.cvsprofiles/1 [1.2.1 20050910]
org.netbeans.modules.vcs.profiles.pvcs/1 [1.2.1 20050910]
org.netbeans.modules.usersguide/1 [1.12.1 20050910]
com.sun.tools.xdplugin/7 [8.2 20051013]
org.netbeans.modules.extbrowser/1 [0.7.1 20050910]
org.netbeans.modules.welcome/1 [1.4.1 20050910]
com.sun.ffj.modules.registration/1 [1.4.1 2005/10/13]
org.netbeans.modules.text/1 [1.11.1 20050910]
Starting system in full screen (MDI) UI mode.
[WinSys:ModeData] Bounds java.awt.Rectangle[x=0,y=0,width=0,height=0] are invalid in org.netbeans.core.windows.layers.Mo
deData@b7141a[Windows/WindowManager/Editing/editor]. Repaired to java.awt.Rectangle[x=0,y=0,width=200,height=200]
[WinSys:ModeData] Maximized bounds java.awt.Rectangle[x=0,y=0,width=0,height=0] are invalid in org.netbeans.core.windows
.layers.ModeData@b7141a[Windows/WindowManager/Editing/editor]. Ignoring
[WinSys:ModeData] Bounds java.awt.Rectangle[x=0,y=0,width=0,height=0] are invalid in org.netbeans.core.windows.layers.Mo
deData@b7141a[Windows/WindowManager/Editing/editor]. Repaired to java.awt.Rectangle[x=0,y=0,width=200,height=200]
[WinSys:ModeData] Maximized bounds java.awt.Rectangle[x=0,y=0,width=0,height=0] are invalid in org.netbeans.core.windows
.layers.ModeData@b7141a[Windows/WindowManager/Editing/editor]. Ignoring
cpp - cannot locate ctags utility...
cpp - cannot locate ctags utility...
cpp - cannot locate ctags utility...
cpp - cannot locate ctags utility...
Initial slashes in Utilities.loadImage deprecated (cf. #20072): /org/netbeans/modules/url/urlObject.gif
*********** Exception occurred ************ at Mon Mar 26 13:58:47 CEST 2007
Annotation: Exception occurred in Request Processor
java.lang.NullPointerException
at org.netbeans.modules.debugger.delegator.DelegatingDebugger.addDebugger(DelegatingDebugger.java:376)
at org.netbeans.modules.debugger.multisession.EnterpriseDebugger.addDebugger(EnterpriseDebugger.java:264)
at org.netbeans.modules.debugger.multisession.EnterpriseDebugger.startDebugger(EnterpriseDebugger.java:213)
at org.netbeans.modules.debugger.delegator.DefaultDebuggerType.startDebugger(DefaultDebuggerType.java:151)
at org.netbeans.modules.debugger.support.ProcessDebuggerType.startDebugger(ProcessDebuggerType.java:234)
at org.openide.debugger.DebuggerType.startDebugger(DebuggerType.java:64)
at org.openide.loaders.ExecSupport.debug(ExecSupport.java:75)
at org.netbeans.modules.debugger.support.actions.StartAction.performAction(StartAction.java:90)
at org.openide.util.actions.NodeAction.performAction(NodeAction.java:184)
at org.openide.util.actions.NodeAction.actionPerformed(NodeAction.java:175)
at org.netbeans.core.ModuleActions$1.run(ModuleActions.java:97)
at org.openide.util.Task.run(Task.java:136)
at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:328)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:670)

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