[2019-01-07 22:16:38,676] [PluginScanner] WARN  com.google.gerrit.server.plugins.PluginLoader : Cannot load plugin github-plugin
com.google.inject.CreationException: Unable to create injector, see the following errors:

1) Error injecting constructor, java.lang.NullPointerException: HTTP Header for GitHub user must be provided
  at com.googlesource.gerrit.plugins.github.oauth.GitHubOAuthConfig.<init>(GitHubOAuthConfig.java:76)
  at com.googlesource.gerrit.plugins.github.oauth.GitHubOAuthConfig.class(GitHubOAuthConfig.java:64)
  while locating com.googlesource.gerrit.plugins.github.oauth.GitHubOAuthConfig
    for the 2nd parameter of com.googlesource.gerrit.plugins.github.oauth.IdentifiedUserGitHubLoginProvider.<init>(IdentifiedUserGitHubLoginProvider.java:48)
  at com.googlesource.gerrit.plugins.github.oauth.IdentifiedUserGitHubLoginProvider.class(IdentifiedUserGitHubLoginProvider.java:31)
  while locating com.googlesource.gerrit.plugins.github.oauth.IdentifiedUserGitHubLoginProvider
  while locating com.googlesource.gerrit.plugins.github.oauth.UserScopedProvider<com.googlesource.gerrit.plugins.github.oauth.GitHubLogin>
    for the 1st parameter of com.googlesource.gerrit.plugins.github.group.GitHubGroupsCache$OrganisationLoader.<init>(GitHubGroupsCache.java:59)
  while locating com.googlesource.gerrit.plugins.github.group.GitHubGroupsCache$OrganisationLoader
  at com.google.gerrit.server.cache.CacheModule.bindCacheLoader(CacheModule.java:100) (via modules: com.googlesource.gerrit.plugins.github.GuiceModule -> com.googlesource.gerrit.plugins.github.group.GitHubGroupsCache$1)
  while locating com.google.common.cache.CacheLoader<java.lang.String, com.googlesource.gerrit.plugins.github.groups.OrganizationStructure> annotated with @com.google.inject.name.Named(value=groups)
  at com.google.gerrit.server.cache.CacheModule.bindCache(CacheModule.java:173) (via modules: com.googlesource.gerrit.plugins.github.GuiceModule -> com.googlesource.gerrit.plugins.github.group.GitHubGroupsCache$1)
  while locating com.google.common.cache.Cache<java.lang.String, com.googlesource.gerrit.plugins.github.groups.OrganizationStructure> annotated with @com.google.inject.name.Named(value=groups)
Caused by: java.lang.NullPointerException: HTTP Header for GitHub user must be provided
        at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:895)
        at com.googlesource.gerrit.plugins.github.oauth.GitHubOAuthConfig.<init>(GitHubOAuthConfig.java:81)
        at com.googlesource.gerrit.plugins.github.oauth.GitHubOAuthConfig$$FastClassByGuice$$eec0905a.newInstance(<generated>)
        at com.google.inject.internal.DefaultConstructionProxyFactory$FastClassProxy.newInstance(DefaultConstructionProxyFactory.java:89)
        at com.google.inject.internal.ConstructorInjector.provision(ConstructorInjector.java:114)
        at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:91)
        at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:306)
        at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40)
        at com.google.inject.internal.SingletonScope$1.get(SingletonScope.java:168)
        at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:39)
        at com.google.inject.internal.SingleParameterInjector.inject(SingleParameterInjector.java:42)
        at com.google.inject.internal.SingleParameterInjector.getAll(SingleParameterInjector.java:65)
        at com.google.inject.internal.ConstructorInjector.provision(ConstructorInjector.java:113)
        at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:91)
        at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:306)
        at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40)
        at com.google.inject.internal.SingletonScope$1.get(SingletonScope.java:168)
        at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:39)
        at com.google.inject.internal.FactoryProxy.get(FactoryProxy.java:62)
        at com.google.inject.internal.SingleParameterInjector.inject(SingleParameterInjector.java:42)
        at com.google.inject.internal.SingleParameterInjector.getAll(SingleParameterInjector.java:65)
        at com.google.inject.internal.ConstructorInjector.provision(ConstructorInjector.java:113)
        at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:91)
        at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:306)
        at com.google.inject.internal.FactoryProxy.get(FactoryProxy.java:62)
        at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40)
        at com.google.inject.internal.SingletonScope$1.get(SingletonScope.java:168)
        at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:39)
        at com.google.inject.internal.InjectorImpl$1.get(InjectorImpl.java:1050)
        at com.google.inject.spi.ProviderLookup$1.get(ProviderLookup.java:111)
        at com.google.gerrit.server.cache.CacheProvider.loader(CacheProvider.java:155)
        at com.google.gerrit.server.cache.PersistentCacheProvider.get(PersistentCacheProvider.java:131)