ALSB install problems

On of our servers was throwing up an exception, while trying to start the Adminserver

####<19-Nov-2008 16:17:22 o'clock GMT> <Critical> <WebLogicServer> <vmmiddleware06> <AdminServer> <Main Thread> <<WLS Kernel>> <> <> <1227111442502> <BEA-000386> <Server subsystem failed. Reason: java.lang.NumberFormatException: null
java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:415)
at java.lang.Integer.parseInt(Integer.java:497)
at weblogic.ldap.EmbeddedLDAP.validateVDEDirectories(EmbeddedLDAP.java:1035)
at weblogic.ldap.EmbeddedLDAP.start(EmbeddedLDAP.java:212)
at weblogic.t3.srvr.SubsystemRequest.run(SubsystemRequest.java:64)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)

The solution appears to be
"This usually happens if your machine is running low on space and WebLogic Server corrupted a file in the embedded LDAP.
To fix this problem you can delete the file /servers//data/ldap/config/replicas.prop or add 'replica.num=0' to replicas.prop file. "

Thanks to the following link
http://satya-ghattu.blogspot.com/2008/10/number-format-exception-while-starting.html