Erro ao abrir EPM Studio

Estamos enfrentando um erro em nosso servidor ao abrir o EPM Studio, não abrindo o software.

Segue o código de erro:
Opc.Ua.ServiceResultException: Cannot access certificate private key. Subject=CN=Elipse Plant Manager Studio
at EpmStudio.Modules.LogOn.LogOnPresenter.LogOnWorker_LogOnCompleted(Object sender, LogOnCompletedEventArgs e)
at EpmStudio.Modules.LogOn.LogOnWorker.<>c__DisplayClass8_0.b__0(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)