Putting project 'orm-ec-flex' on hold due to unhandled exception: 
System.ArgumentNullException: Value cannot be null. (Parameter 'path1')
   at System.IO.Path.Combine(String path1, String path2)
   at SIL.LCModel.Infrastructure.Impl.SharedXMLBackendProvider.CreateOrOpen(String name, Int64 capacity, Boolean createdNew)
   at SIL.LCModel.Infrastructure.Impl.SharedXMLBackendProvider.CreateSharedMemory(Boolean createdNew)
   at SIL.LCModel.Infrastructure.Impl.SharedXMLBackendProvider.StartupInternal(Int32 currentModelVersion)
   at SIL.LCModel.Infrastructure.Impl.BackendProvider.StartupInternalWithDataMigrationIfNeeded(IThreadedProgress progressDlg)
   at SIL.LCModel.Infrastructure.Impl.BackendProvider.StartupExtantLanguageProject(IProjectIdentifier projectId, Boolean fBootstrapSystem, IThreadedProgress progressDlg)
   at SIL.LCModel.LcmCache.<>c__DisplayClass12_0.<CreateCacheFromExistingData>b__0(IDataSetup dataSetup)
   at SIL.LCModel.LcmCache.CreateCacheInternal(IProjectIdentifier projectId, String userWsIcuLocale, ILcmUI ui, ILcmDirectories dirs, LcmSettings settings, Action`1 doThe, Action`1 initialize)
   at SIL.LCModel.LcmCache.CreateCacheFromExistingData(IProjectIdentifier projectId, String userWsIcuLocale, ILcmUI ui, ILcmDirectories dirs, LcmSettings settings, IThreadedProgress progressDlg)
   at LfMerge.Core.FieldWorks.FwProject.TryGetLcmCache() in /home/builder/repo/src/LfMerge.Core/FieldWorks/FwProject.cs:line 97
   at LfMerge.Core.FieldWorks.FwProject..ctor(LfMergeSettings settings, String database) in /home/builder/repo/src/LfMerge.Core/FieldWorks/FwProject.cs:line 31
   at LfMerge.Core.LanguageForgeProject.get_FieldWorksProject() in /home/builder/repo/src/LfMerge.Core/LanguageForgeProject.cs:line 93
   at LfMerge.Core.Actions.TransferMongoToLcmAction.DoRun(ILfProject project) in /home/builder/repo/src/LfMerge.Core/Actions/TransferMongoToLcmAction.cs:line 53
   at LfMerge.Core.Actions.Action.Run(ILfProject project) in /home/builder/repo/src/LfMerge.Core/Actions/Action.cs:line 110
   at LfMerge.Core.Actions.SynchronizeAction.DoRun(ILfProject project) in /home/builder/repo/src/LfMerge.Core/Actions/SynchronizeAction.cs:line 64
   at LfMerge.Core.Actions.Action.Run(ILfProject project) in /home/builder/repo/src/LfMerge.Core/Actions/Action.cs:line 110
   at LfMerge.Program.RunAction(String projectCode, ActionNames currentAction) in /home/builder/repo/src/LfMerge/Program.cs:line 124