Wiki creation log contains errors and Application Index is missing

Applying [INSTALL] for extension [Application Index Application 15.5.1] on namespace [Math Club] from previous extension(s) []
Invalid locale format: pt-BR
class java.lang.IllegalArgumentException: Invalid locale format: pt-BR
    at org.apache.commons.lang3.LocaleUtils.parseLocale(LocaleUtils.java:268)
    at org.apache.commons.lang3.LocaleUtils.toLocale(LocaleUtils.java:348)
    at org.xwiki.xar.internal.XarUtils.getReference(XarUtils.java:120)
    at org.xwiki.xar.XarPackage.readEntry(XarPackage.java:270)
    at org.xwiki.xar.XarPackage.read(XarPackage.java:226)
    at org.xwiki.xar.XarPackage.<init>(XarPackage.java:161)
    at org.xwiki.extension.xar.internal.repository.XarInstalledExtension.<init>(XarInstalledExtension.java:47)
    at org.xwiki.extension.xar.internal.repository.XarInstalledExtensionRepository.addCacheXarExtension(XarInstalledExtensionRepository.java:186)
    at org.xwiki.extension.xar.internal.repository.XarInstalledExtensionRepository.updateCachedXarExtension(XarInstalledExtensionRepository.java:173)
    at org.xwiki.extension.xar.internal.repository.InstalledExtensionSynchronizer.onEvent(InstalledExtensionSynchronizer.java:113)
    at org.xwiki.observation.internal.DefaultObservationManager.notify(DefaultObservationManager.java:338)
    at org.xwiki.observation.internal.DefaultObservationManager.notify(DefaultObservationManager.java:303)
    at org.xwiki.observation.internal.DefaultObservationManager.notify(DefaultObservationManager.java:354)
    at org.xwiki.extension.job.internal.AbstractExtensionJob.installExtension(AbstractExtensionJob.java:336)
    at org.xwiki.extension.job.internal.AbstractExtensionJob.applyAction(AbstractExtensionJob.java:233)
    at org.xwiki.extension.job.internal.AbstractExtensionJob.applyActions(AbstractExtensionJob.java:181)
    at org.xwiki.extension.job.internal.InstallJob.runInternal(InstallJob.java:140)
    at org.xwiki.job.AbstractJob.runInContext(AbstractJob.java:246)
    at org.xwiki.job.AbstractJob.run(AbstractJob.java:223)
    at org.xwiki.platform.wiki.creationjob.internal.ExtensionInstaller.installExtension(ExtensionInstaller.java:73)
    at org.xwiki.platform.wiki.creationjob.internal.steps.ProvisionWikiStep.execute(ProvisionWikiStep.java:78)
    at org.xwiki.platform.wiki.creationjob.internal.WikiCreationJob.runInternal(WikiCreationJob.java:96)
    at org.xwiki.job.AbstractJob.runInContext(AbstractJob.java:246)
    at org.xwiki.job.AbstractJob.run(AbstractJob.java:223)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.base/java.lang.Thread.run(Unknown Source)
Successfully applied [INSTALL] for extension [Application Index Application 15.5.1] on namespace [Math Club] from previous extension(s) []