当Xamarin中的“Build All”启动时，我收到一个未处理的异常错误，如下所示：
Xamarin.Components.Ide.ApiClients.XamarinStoreException: No user found.
at Xamarin.Components.Ide.ApiClients.XamarinStore.<StartTrial>m__0 (System.Threading.Tasks.Task`1 t) [0x00049] in /Users/builder/data/lanes/2508/0b60eecd/source/md-addins/Xamarin.Ide/Xamarin.Components.Ide/ApiClients/XamarinStore.cs:80
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2[TAntecedentResult,TResult].InnerInvoke () [0x00027] in /private/tmp/source-mono-mac-4.2.0-branch/bockbuild-mono-4.2.0-branch/profiles/mono-mac-xamarin/build-root/mono-4.2.1/external/referencesource/mscorlib/system/threading/Tasks/TaskContinuation.cs:207
at System.Threading.Tasks.Task.Execute () [0x00016] in /private/tmp/source-mono-mac-4.2.0-branch/bockbuild-mono-4.2.0-branch/profiles/mono-mac-xamarin/build-root/mono-4.2.1/external/referencesource/mscorlib/system/threading/Tasks/Task.cs:2523