Google TTS addon for OH2

I install this version and I have no more error like here : Google Calendar Scheduler - No instructions in log file (conflit with gcal binding).
I clean the cache and enter OAuth2 parameters. Everything seems to be ok.

2020-01-24 15:05:15.385 [INFO ] [oauth2client.internal.OAuthConnector] - grant type authorization_code to URL https://accounts.google.com/o/oauth2/token success
2020-01-24 15:05:15.544 [WARN ] [.googletts.internal.GoogleTTSService] - Audio format OGG_OPUS is not yet supported.
2020-01-24 15:05:15.591 [WARN ] [.googletts.internal.GoogleTTSService] - Audio format OGG_OPUS is not yet supported.

But I can’t choose voice :

 voice voices
An unexpected error occurred during execution.

and log :

15:09:26.903 [ERROR] [arthome.io.console.ConsoleInterpreter] - An error occurred while executing the console command.
java.util.NoSuchElementException: null
        at java.util.ArrayList$Itr.next(ArrayList.java:862) ~[?:1.8.0_242]
        at org.eclipse.smarthome.core.voice.internal.VoiceManagerImpl.getPreferredVoice(VoiceManagerImpl.java:438) ~[?:?]
        at org.eclipse.smarthome.core.voice.internal.VoiceConsoleCommandExtension.getDefaultVoice(VoiceConsoleCommandExtension.java:108) ~[?:?]
        at org.eclipse.smarthome.core.voice.internal.VoiceConsoleCommandExtension.execute(VoiceConsoleCommandExtension.java:85) ~[?:?]
        at org.eclipse.smarthome.io.console.ConsoleInterpreter.execute(ConsoleInterpreter.java:55) [bundleFile:?]
        at org.eclipse.smarthome.io.console.karaf.internal.CommandWrapper.execute(CommandWrapper.java:78) [bundleFile:?]
        at org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:68) [bundleFile:4.2.7]
        at org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:86) [bundleFile:4.2.7]
        at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:599) [bundleFile:4.2.7]
        at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:526) [bundleFile:4.2.7]
        at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:415) [bundleFile:4.2.7]
        at org.apache.felix.gogo.runtime.Pipe.doCall(Pipe.java:416) [bundleFile:4.2.7]
        at org.apache.felix.gogo.runtime.Pipe.call(Pipe.java:229) [bundleFile:4.2.7]
        at org.apache.felix.gogo.runtime.Pipe.call(Pipe.java:59) [bundleFile:4.2.7]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_242]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_242]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_242]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_242]

I’m using OH 2.5 and zulu-8 (8.44.0.11)