To recreate:

groovy:000> getVDB("Interoperability", 2)
===> Interoperability.2[Weather[Weather/MessageWeather/java:WeatherDS]]

groovy:000> changeVDBConnectionType("Interoperability", 2, "ANY")

ERROR org.teiid.adminapi.AdminComponentException:
Error Code:0 Message:Error Code:0 Message:Failed to convert from String value to java.lang.String type
at org.teiid.client.util.ExceptionUtil.convertException (ExceptionUtil.java:72)
at org.teiid.net.socket.SocketServerInstanceImpl$RemoteInvocationHandler.invoke (SocketServerInstanceImpl.java:365)
at org.teiid.net.socket.SocketServerConnection$1.invoke (SocketServerConnection.java:216)
at $Proxy7.changeVDBConnectionType (Unknown Source)
at org.teiid.adminapi.AdminFactory$AdminProxy.invoke (AdminFactory.java:76)
at $Proxy7.changeVDBConnectionType (Unknown Source)
at org.teiid.adminshell.AdminShell.changeVDBConnectionType (AdminShell.java:163)
at org.teiid.adminshell.AdminShell$changeVDBConnectionType.callStatic (Unknown Source)
at groovysh_evaluate.run (groovysh_evaluate:3)