csharp-language-server-protocol: Message: Internal Error - System.ArgumentException: OmniSharp only supports being launched with a directory path or a path to a solution (.sln) file.

Ubuntu 18.04 Environment docker Client: Monaco-languageclient

csharp Client:   Message: Internal Error - System.ArgumentException: OmniSharp only supports being launched with a directory path or a path to a solution (.sln) file.
Parameter name: path
  at OmniSharp.Services.OmniSharpEnvironment..ctor (System.String path, System.Int32 hostPid, Microsoft.Extensions.Logging.LogLevel logLevel, System.String[] additionalArguments) [0x00062] in <cc784888e5004669a7cdfce6a3d2dba5>:0 
  at OmniSharp.LanguageServerProtocol.LanguageServerHost.CreateCompositionHost (OmniSharp.Extensions.LanguageServer.Protocol.Models.InitializeParams initializeParams) [0x00048] in <06df7f2c43b54964be79301e33ec66cc>:0 
  at OmniSharp.LanguageServerProtocol.LanguageServerHost.Initialize (OmniSharp.Extensions.LanguageServer.Server.ILanguageServer server, OmniSharp.Extensions.LanguageServer.Protocol.Models.InitializeParams initializeParams) [0x00000] in <06df7f2c43b54964be79301e33ec66cc>:0 
  at OmniSharp.Extensions.LanguageServer.Server.LanguageServer+<>c__DisplayClass59_0.<OmniSharp.Extensions.Embedded.MediatR.IRequestHandler<OmniSharp.Extensions.LanguageServer.Protocol.Models.InitializeParams,OmniSharp.Extensions.LanguageServer.Protocol.Models.InitializeResult>.Handle>b__0 (OmniSharp.Extensions.LanguageServer.Server.InitializeDelegate c) [0x00000] in <12a97e97079c4b10a770c2869fa566a9>:0 
  at System.Linq.Enumerable+SelectListIterator`2[TSource,TResult].MoveNext () [0x00048] in <59093ef301a24e5a91cb0295fb832cca>:0 
  at System.Threading.Tasks.Task.WhenAll (System.Collections.Generic.IEnumerable`1[T] tasks) [0x000ba] in <a1ae6166591d4020b810288d19af38d4>:0 
  at OmniSharp.Extensions.LanguageServer.Server.LanguageServer.OmniSharp.Extensions.Embedded.MediatR.IRequestHandler<OmniSharp.Extensions.LanguageServer.Protocol.Models.InitializeParams,OmniSharp.Extensions.LanguageServer.Protocol.Models.InitializeResult>.Handle (OmniSharp.Extensions.LanguageServer.Protocol.Models.InitializeParams request, System.Threading.CancellationToken token) [0x001a1] in <12a97e97079c4b10a770c2869fa566a9>:0 
  at OmniSharp.Extensions.LanguageServer.Server.Pipelines.ResolveCommandPipeline`2[TRequest,TResponse].Handle (TRequest request, System.Threading.CancellationToken cancellationToken, OmniSharp.Extensions.Embedded.MediatR.RequestHandlerDelegate`1[TResponse] next) [0x000e1] in <12a97e97079c4b10a770c2869fa566a9>:0 
  at OmniSharp.Extensions.JsonRpc.RequestRouterBase`1[TDescriptor].RouteRequest (TDescriptor descriptor, OmniSharp.Extensions.JsonRpc.Server.Request request, System.Threading.CancellationToken token) [0x0038a] in <709d80c63bce4fcd8b1071c79413b97b>:0 
  Code: -32602