Detected Razor language version downgrade. This is typically caused by a reference to the Microsoft.AspNetCore.Razor.Design package. Consider removing this package reference.

'IHostingEnvironment' is obsolete: 'This type is obsolete and will be removed in a future version. The recommended alternative is Microsoft.AspNetCore.Hosting.IWebHostEnvironment.'

'IHostingEnvironment' is obsolete: 'This type is obsolete and will be removed in a future version. The recommended alternative is Microsoft.AspNetCore.Hosting.IWebHostEnvironment.'

'ICredentialProvider' is obsolete: 'Use `ConfigurationBotFrameworkAuthentication` instead to configure credentials.'

'SimpleCredentialProvider' is obsolete: 'Use `ConfigurationBotFrameworkAuthentication` instead to configure credentials.'

'ApplicationInsightsServiceOptions.InstrumentationKey' is obsolete: 'InstrumentationKey based global ingestion is being deprecated. Use ApplicationInsightsServiceOptions.ConnectionString. See https://github.com/microsoft/ApplicationInsights-dotnet/issues/2560 for more details.'

'CompatibilityVersion' is obsolete: 'This API is obsolete and will be removed in a future version. Consider removing usages.'

'CompatibilityVersion.Version_2_1' is obsolete: 'This CompatibilityVersion value is obsolete.'

'MvcCoreMvcBuilderExtensions.SetCompatibilityVersion(IMvcBuilder, CompatibilityVersion)' is obsolete: 'This API is obsolete and will be removed in a future version. Consider removing usages.'