unity in app purchase android build problem IOExeption

hi, i have question about unity in app purchase service.
before i build i have to integrate with my project, and at console the purchase function is work on console editor. but i i try to build the project i got some error like this :

IOException: Sharing violation on path Temp/StagingArea\android-libraries\play-services-base-9.6.1\res\drawable-hdpi-v4\Thumbs.db
System.IO.File.Delete (System.String path) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.IO/File.cs:179)
System.IO.Directory.RecursiveDelete (System.String path) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.IO/Directory.cs:195)
System.IO.Directory.RecursiveDelete (System.String path) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.IO/Directory.cs:190)
System.IO.Directory.RecursiveDelete (System.String path) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.IO/Directory.cs:190)
System.IO.Directory.RecursiveDelete (System.String path) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.IO/Directory.cs:190)
System.IO.Directory.Delete (System.String path, Boolean recursive) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.IO/Directory.cs:205)
UnityEditor.FileUtil.CreateOrCleanDirectory (System.String dir) (at C:/buildslave/unity/build/Editor/Mono/FileUtil.cs:245)
UnityEditor.Android.PostProcessor.Tasks.Initializer.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.Android.PostProcessAndroidPlayer.PostProcess (BuildTarget target, System.String stagingAreaData, System.String stagingArea, System.String playerPackage, System.String installPath, System.String companyName, System.String productName, BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry)
UnityEditor.Android.AndroidBuildPostprocessor.PostProcess (BuildPostProcessArgs args)
UnityEditor.PostprocessBuildPlayer.Postprocess (BuildTarget target, System.String installPath, System.String companyName, System.String productName, Int32 width, Int32 height, System.String downloadWebplayerUrl, System.String manualDownloadWebplayerUrl, BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.BuildReporting.BuildReport report) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:176)
UnityEditor.HostView:OnGUI()

this error was come if i try build my project, anyone know how to solve this problem? thankyou.

please somebody can help me?

Windows has done a fine job of locking up your file for you as it either thinks that some other program should only have access to it or it requires some special permission. The easiest fix for this is to close Unity and delete the Temp folder.