WAS 5.0 Express problems...

I'm trying to update an application on my WAS - Express 5.0 server and it 
won't let me anymore...when i try, it says Uninstall failed through the 
HTTP Admin GUI...it won't even let me uninstall or install anything...I've 
recently installed WDSCi 6.0 on my PC but that shouldn't have anything to 
do with my actual WAS server on our iSeries...I also installed the PTFs 
needed to run WDSCi 6.0 on our iSeries, but all the PTF cover letters say 
that it can also run WDSCi 5.1.2...here's the error log generated when I 
try to update:
File View
/QIBM/UserData/WebASE/ASE5/NALAppSvr/logs/NALAppSvr/eRequisitions_UNINSTALL_1124088725392.log
 

Command ran /QIBM/ProdData/WebASE/ASE5/bin/wsadmin -instance NALAppSvr 
-conntype NONE -c $AdminApp uninstall "eRequisitions" 
Standard output:
com.ibm.as400.access.InternalErrorException: Unexpected exception.
      java/lang/Throwable.<init>(Ljava/lang/String;)V+4 
(Throwable.java:85) 
      java/lang/Exception.<init>(Ljava/lang/String;)V+1 
(Exception.java:33) 
      java/lang/RuntimeException.<init>(Ljava/lang/String;)V+1 
(RuntimeException.java:38) 
      com/ibm/as400/access/InternalErrorException.<init>(I)V+12 
(InternalErrorException.java:105) 
 
com/ibm/as400/security/auth/AuthenticationSystem.handleUnexpectedException(Ljava/lang/Throwable;)V+13
 
(AuthenticationSystem.java:63) 
 
com/ibm/as400/security/auth/AS400Credential.getImplPrimitive()Lcom/ibm/as400/security/auth/AS400CredentialImpl;+291
 
(AS400Credential.java:543) 
 
com/ibm/as400/security/auth/ProfileTokenCredential.setToken(Ljava/lang/String;Ljava/lang/String;)V+79
 
(ProfileTokenCredential.java:936) 
 
com/ibm/websphere/os400/command/processors/PSProcessor.process(Ljava/lang/String;Ljava/lang/String;)Z+68
 
(PSProcessor.java:40) 
      com/ibm/ws/scripting/WasxShell.main([Ljava/lang/String;)V+10 
(WasxShell.java:806) 
      com/ibm/ws/bootstrap/WSLauncher.main([Ljava/lang/String;)V+473 
(WSLauncher.java:94) 
      com/ibm/websphere/os400/command/Wrapper.run()V+208 
(Wrapper.java:166) 

Standard error:

Anyone have any idea why I'm getting this error now?...

Shane