MissingMethodException: Method not found exception

[jrowe88]

Hello - I updated to the latest version of configuration builder and am getting the following exception:

System.MissingMethodException: Method not found: 'System.Threading.Tasks.ValueTask`1<Boolean> System.Collections.Generic.IAsyncEnumerator`1.MoveNextAsync()'. 

I'm not sure how to resolve this. I am using the latest (version 8.0.0) Microsoft.Bcl.AsyncInterfaces which should include the supposedly missing method. All the configuration builder libraries are the latest version.

Stack Trace

[MissingMethodException: Method not found: 'System.Threading.Tasks.ValueTask`1<Boolean> System.Collections.Generic.IAsyncEnumerator`1.MoveNextAsync()'.]
   Microsoft.Configuration.ConfigurationBuilders.<GetAllValuesAsync>d__39.MoveNext() +0
   System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.Start(TStateMachine& stateMachine) +122
   Microsoft.Configuration.ConfigurationBuilders.AzureAppConfigurationBuilder.GetAllValuesAsync(String prefix) +97
   Microsoft.Configuration.ConfigurationBuilders.<<GetAllValues>b__0>d.MoveNext() +55

[AggregateException: One or more errors occurred.]
   System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification) +4923493
   Microsoft.Configuration.ConfigurationBuilders.AzureAppConfigurationBuilder.GetAllValues(String prefix) +130
   Microsoft.Configuration.ConfigurationBuilders.KeyValueConfigBuilder.EnsureGreedyInitialized() +222

[KeyValueConfigBuilderException: 'DefaultConfig' GetAllValues() Error: One or more errors occurred.]
   Microsoft.Configuration.ConfigurationBuilders.KeyValueConfigBuilder.EnsureGreedyInitialized() +657
   Microsoft.Configuration.ConfigurationBuilders.KeyValueConfigBuilder.ProcessConfigurationSection(ConfigurationSection configSection) +740
   System.Configuration.ConfigurationBuilderChain.ProcessConfigurationSection(ConfigurationSection configSection) +136

Configuration Section showing defined builders

     ...
     <section name="configBuilders" type="System.Configuration.ConfigurationBuildersSection, System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" restartOnExternalChanges="false" requirePermission="false" />
  </configSections>

  <configBuilders>
    <builders>
      <add name="EnvironmentVariableConfig" mode="Token" escapeExpandedValues="true" type="Microsoft.Configuration.ConfigurationBuilders.EnvironmentConfigBuilder, Microsoft.Configuration.ConfigurationBuilders.Environment" />

      <add name="DefaultConfig" mode="Greedy" prefix="" stripPrefix="false" enabled="true" labelFilter="" useAzureKeyVault="true" connectionString="${Azure.AppConfiguration.Connection}" type="Microsoft.Configuration.ConfigurationBuilders.AzureAppConfigurationBuilder, Microsoft.Configuration.ConfigurationBuilders.AzureAppConfiguration" />

      <add name="DeployEnvironmentConfig" mode="Greedy" prefix="" stripPrefix="false" enabled="true" labelFilter="${Deploy.Environment}" useAzureKeyVault="true" connectionString="${Azure.AppConfiguration.Connection}" type="Microsoft.Configuration.ConfigurationBuilders.AzureAppConfigurationBuilder, Microsoft.Configuration.ConfigurationBuilders.AzureAppConfiguration" />

      <add name="DeployEnvironmentExpansions" mode="Token" escapeExpandedValues="true" tokenPattern="\${([a-zA-Z0-9_.:]+)\}" enabled="true" prefix="" stripPrefix="false" labelFilter="${Deploy.Environment}" useAzureKeyVault="true" connectionString="${Azure.AppConfiguration.Connection}" type="Microsoft.Configuration.ConfigurationBuilders.AzureAppConfigurationBuilder, Microsoft.Configuration.ConfigurationBuilders.AzureAppConfiguration" />

    </builders>
  </configBuilders>