ZoneClient#list doesn't work

Calling the ZoneClient#list method always produces the following error message:

```
20201218-app3-137704 EF00004 : Ungueltiger Auftragstyp.
at org.domainrobot.sdk.client.clients.AbstractClient.handleException(AbstractClient.java:173)
at org.domainrobot.sdk.client.clients.ZoneClient.list(ZoneClient.java:165)
```