Error Building

Every time i try to build a WP8.1 project, i receive both of following messages. Idk why this happens, but it only gives me this problem when i try to build for windowsstore. Others plattaforms are working properly :|.

Error building Player because scripts have compile errors

Could not start compilationWin32Exception: ApplicationName='C:\Program Files\Unity\Editor\Data\Tools\Roslyn\CoreRun.exe', CommandLine='"C:\Program Files\Unity\Editor\Data\Tools\Roslyn\csc.exe" /noconfig @Temp/UnityTempFile-c7227b65371b2394c83f013e55e945ef', CurrentDirectory='' System.Diagnostics.Process.Start_noshell (System.Diagnostics.ProcessStartInfo startInfo, System.Diagnostics.Process process) System.Diagnostics.Process.Start_common (System.Diagnostics.ProcessStartInfo startInfo, System.Diagnostics.Process process) System.Diagnostics.Process.Start () (wrapper remoting-invoke-with-check) System.Diagnostics.Process:Start () UnityEditor.Utils.Program.Start () (at C:/buildslave/unity/build/Editor/Mono/Utils/Program.cs:33) UnityEditor.Scripting.Compilers.MicrosoftCSharpCompiler.StartCompilerImpl (System.Collections.Generic.List`1 arguments, System.String argsPrefix, Boolean msBuildCompiler) (at C:/buildslave/unity/build/Editor/Mono/Scripting/Compilers/MicrosoftCSharpCompiler.cs:285) UnityEditor.Scripting.Compilers.MicrosoftCSharpCompiler.StartCompiler () (at C:/buildslave/unity/build/Editor/Mono/Scripting/Compilers/MicrosoftCSharpCompiler.cs:316) UnityEditor.Scripting.Compilers.ScriptCompilerBase.BeginCompiling () (at C:/buildslave/unity/build/Editor/Mono/Scripting/Compilers/ScriptCompilerBase.cs:47) UnityEditor.HostView:OnGUI()