3118300 - Unable to export the private key using ExportPrivateKey - exception in java.lang.NullPointerException in step 8 following KBA 1899365

Following steps in KBA 1899365 - How to setup self-signed test SSL with ASE and SDK - SAP ASE
in step 8 - Grab ASE private key. Exception and in java.lang.NullPointerException  is generated 

java com.sap.security.ExportPrivateKey -keystore ASEName.jks -alias ASEname -file ASEname.key -storepass mystorepassword
Exception in thread "main" java.lang.NullPointerException: while trying to invoke the method java.security.KeyPair.getPrivate() of a null object loaded from a local variable at slot 7
        at com.sap.security.ExportPrivateKey.export(ExportPrivateKey.java:131)
        at com.sap.security.ExportPrivateKey.main(ExportPrivateKey.java:39)

• SAP Adaptive Server Enterprise 16 (ASE)
• SAP ASE SDK 16 

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