Tomcat does not start - locale error

Hi all,

I am having a problem when starting Tomcat. The following error is added to the app server log:

2020-10-06 10:27:24,023 [localhost-startStop-1] INFO  com.appiancorp.common.spring.AbstractSpringContextListener - Received ContextRefreshedEvent: org.springframework.context.event.ContextRefreshedEvent[source=Root WebApplicationContext: startup date [Tue Oct 06 10:25:15 GMT 2020]; root of context hierarchy]
2020-10-06 10:27:24,145 [localhost-startStop-1] ERROR com.appiancorp.ads.designobjects.schema.DesignObjectSchema - APNX-1-4408-001 - Failed to create DesignObjectSchema.
com.appian.data.client.AdsUserInputException: APNX-3-1000-0A1: Invalid locale (de_DE). Locale must be one of ("unicode";"en_US";"ar";"zh_CN";"zh_HK";"nl";"en_GB";"fr_CA";"fr_FR";"de";"it";"ja";"pl";"pt";"ru";"es";"sv";"ko")
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

We are upgrading Appian on premise and the error happens during the first start. We havent added any new local, we were already using de_DE

In our cloud we also use the same locale and havent been updated by Appian yet (it is still on 20.1). I wonder if it is a common issue