title: OpsHub Visual Studio Migration Utility does not find any "Source Users" to map
body: <p>I am trying to migrate from TFS 2010 to Visual Studio Team Services (source code only). 
  Everything goes fine until I get to the user mapping screen. 
  It has no issues finding the destination users, but it does not find any source users, so i cannot map them, and therefore cannot continue to the next step.</p>
  
  <p>There are no errors.
  I have tried three different projects.
  I am using the free version: OVSMU-V2.5.0.001</p>
  
  <p>EDIT- adding error from opshub.log:</p>
  
  <p>04/26/2017 08:56:10,840 ERROR [localhost-startStop-1] (com.opshub.JSON.QuartzIntializationServlet) - Error while trying to install license VisualStudio.lic
  com.opshub.license.exception.LicenseException: License with key 1258 is already installed
      at com.opshub.license.install.LicenseInstaller.checkDuplicateLicense(LicenseInstaller.java:127)
      at com.opshub.license.install.LicenseInstaller.installLicense(LicenseInstaller.java:72)
      at com.opshub.JSON.QuartzIntializationServlet.registerLicFile(QuartzIntializationServlet.java:369)
      at com.opshub.JSON.QuartzIntializationServlet.installLicenses(QuartzIntializationServlet.java:345)
      at com.opshub.JSON.QuartzIntializationServlet.contextInitialized(QuartzIntializationServlet.java:138)
      at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4733)
      at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5199)
      at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:152)
      at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:726)
      at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:702)
      at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
      at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:951)
      at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1819)
      at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
      at java.util.concurrent.FutureTask.run(FutureTask.java:266)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
      at java.lang.Thread.run(Thread.java:745)</p>