ADSUser and Password Saving error

I'm running Netweaver 2004s - SP13 AIX5.3 / Oracle 10g

I'm following the configuration guide of ADS netweaver '04s and im having problems saving trying to do this step in the guide:

Choose Web Service Clients → sap.com > tc_wdpdfobject → com.sap.tc.webdynpro.adsproxy.AdsProxy*ConfigPort_Document.

4. From the Authentication list, select BASIC.

5. In the User and Password boxes, enter as Username ADSUser and a Password.

6. Choose Save.

After I press save, nothing happens, it wont save.

When I press it over and over again, I get this error:

An Error occurred while saving the data: Reason: java.util.concurrentmodificationexception null

Log Shows:

An error occurred while updating the destination sap.com/tc_wdpdfobject/com.sap.tc.webdynpro.adsproxy.AdsProxy/SecConfigPort_Document of type WebService. The error was <null>.