'spacewalk-api' command is failing with "Fault returned from XML RPC Server Could not find translator for class java.lang.String to class java.lang.Integer"

Issue

• spacwalk-api command fails with below message:

[root@mysatellite ~]# spacewalk-api --server=satellite.test.internal.com --user=***** --password=****** system.listPackages %session% system_id
Fault returned from XML RPC Server, fault code -1: com.redhat.rhn.common.translation.TranslationException: Could not find translator for class java.lang.String to class java.lang.Intege

• The Satellite API script fails with below error,

/Ruby21-x64/lib/ruby/2.1.0/xmlrpc/client.rb:271:in `call': com.redhat.rhn.common.translation.TranslationException: Could not find translator for class java.lang.String to class java.lang.Integer (XMLRPC::FaultException)
        from ./set-rhs-software-channel.rb:17:in `<main>'