Error in .Net program

[mcp111]

What is this error when I run the visual studio solution? StackExchange.Redis.RedisConnectionException HResult=0x80131500 Message=It was not possible to connect to the redis server(s). UnableToConnect on localhost:6379/Interactive, Initializing/NotStarted, last: NONE, origin: BeginConnectAsync, outstanding: 0, last-read: 2s ago, last-write: 2s ago, keep-alive: 60s, state: Connecting, mgr: 10 of 10 available, last-heartbeat: never, global: 12s ago, v: 2.1.58.34321 Source=StackExchange.Redis StackTrace: at StackExchange.Redis.ConnectionMultiplexer.ConnectImpl(ConfigurationOptions configuration, TextWriter log) in //src/StackExchange.Redis/ConnectionMultiplexer.cs:line 1169 at StackExchange.Redis.ConnectionMultiplexer.Connect(ConfigurationOptions configuration, TextWriter log) in //src/StackExchange.Redis/ConnectionMultiplexer.cs:line 1037 at StackExchange.Redis.ConnectionMultiplexer.Connect(String configuration, TextWriter log) in /_/src/StackExchange.Redis/ConnectionMultiplexer.cs:line 1020 at ShorteningService.Infrastructure.DependencyInjection.AddInfrastructure(IServiceCollection services) in E:\partha\UrlShortener-master\UrlShortener-master\ShorteningService\Infrastructure\DependencyInjection.cs:line 16 at ShorteningService.Startup.ConfigureServices(IServiceCollection services) in E:\partha\UrlShortener-master\UrlShortener-master\ShorteningService\Api\Startup.cs:line 35 at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.InvokeCore(Object instance, IServiceCollection services) at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass9_0.<Invoke>g__Startup|0(IServiceCollection serviceCollection) at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.Invoke(Object instance, IServiceCollection services) at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass8_0.<Build>b__0(IServiceCollection services) at Microsoft.AspNetCore.Hosting.GenericWebHostBuilder.UseStartup(Type startupType, HostBuilderContext context, IServiceCollection services) at Microsoft.AspNetCore.Hosting.GenericWebHostBuilder.<>c__DisplayClass12_0.<UseStartup>b__0(HostBuilderContext context, IServiceCollection services) at Microsoft.Extensions.Hosting.HostBuilder.CreateServiceProvider() at Microsoft.Extensions.Hosting.HostBuilder.Build() at ShorteningService.Program.Main(String[] args) in E:\partha\UrlShortener-master\UrlShortener-master\ShorteningService\Api\Program.cs:line 16