ERROR client sallos helppoo pleaseee

[n0 lL0v3]

System.IO.FileLoadException: Could not load file or assembly 'Sallos.Client, Version=2.1.0.0, Culture=neutral, PublicKeyToken=6cc7e8bd89c5c6bf' or one of its dependencies. Application exception (Exception from HRESULT: 0x80131600)
File name: 'Sallos.Client, Version=2.1.0.0, Culture=neutral, PublicKeyToken=6cc7e8bd89c5c6bf' ---> Sallos.AssemblyNotFoundException: Unable to locate assembly 'Sallos.Client'.
at Sallos.AssemblyManager.AssemblyResolve(Object sender, ResolveEventArgs args)
at System.AppDomain.OnAssemblyResolveEvent(String assemblyFullName)
at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
at System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
at System.Reflection.Assembly.Load(String assemblyString)
at Sallos.StartupManager.Launch(String[] args)
at Sallos.StartupManager.Startup(String[] args)
at Sallos.StartupManager.Main(String[] args)

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what should i do for this??