When I saw that the 2.0.3.7 release included a fix for box.com I went ahead and updated. This resolved the issue I had been having with actually being able to make a backup, but it has introduced a new error of:
Failed: One or more errors occurred.
Details: System.AggregateException: One or more errors occurred. ---> System.AggregateException: 409 - item_name_in_use: Item with the same name already exists ---> System.Exception: 409 - item_name_in_use: Item with the same name already exists
at Duplicati.Library.Main.BackendManager.WaitForComplete (Duplicati.Library.Main.Database.LocalDatabase db, System.Data.IDbTransaction transation) [0x00067] in <c093ff03452d49f59d25577493ea2214>:0
at Duplicati.Library.Main.Operation.FilelistProcessor.UploadVerificationFile (System.String backendurl, Duplicati.Library.Main.Options options, Duplicati.Library.Main.IBackendWriter result, Duplicati.Library.Main.Database.LocalDatabase db, System.Data.IDbTransaction transaction) [0x00094] in <c093ff03452d49f59d25577493ea2214>:0
at Duplicati.Library.Main.Operation.BackupHandler+<RunAsync>d__19.MoveNext () [0x00e5c] in <c093ff03452d49f59d25577493ea2214>:0
--- End of inner exception stack trace ---
at Duplicati.Library.Main.Operation.BackupHandler+<RunAsync>d__19.MoveNext () [0x01018] in <c093ff03452d49f59d25577493ea2214>:0
--- End of inner exception stack trace ---
at CoCoL.ChannelExtensions.WaitForTaskOrThrow (System.Threading.Tasks.Task task) [0x0005d] in <6973ce2780de4b28aaa2c5ffc59993b1>:0
at Duplicati.Library.Main.Operation.BackupHandler.Run (System.String[] sources, Duplicati.Library.Utility.IFilter filter) [0x00008] in <c093ff03452d49f59d25577493ea2214>:0
at Duplicati.Library.Main.Controller+<>c__DisplayClass14_0.<Backup>b__0 (Duplicati.Library.Main.BackupResults result) [0x00035] in <c093ff03452d49f59d25577493ea2214>:0
at Duplicati.Library.Main.Controller.RunAction[T] (T result, System.String[]& paths, Duplicati.Library.Utility.IFilter& filter, System.Action`1[T] method) [0x0011d] in <c093ff03452d49f59d25577493ea2214>:0
---> (Inner Exception #0) System.AggregateException: 409 - item_name_in_use: Item with the same name already exists ---> System.Exception: 409 - item_name_in_use: Item with the same name already exists
at Duplicati.Library.Main.BackendManager.WaitForComplete (Duplicati.Library.Main.Database.LocalDatabase db, System.Data.IDbTransaction transation) [0x00067] in <c093ff03452d49f59d25577493ea2214>:0
at Duplicati.Library.Main.Operation.FilelistProcessor.UploadVerificationFile (System.String backendurl, Duplicati.Library.Main.Options options, Duplicati.Library.Main.IBackendWriter result, Duplicati.Library.Main.Database.LocalDatabase db, System.Data.IDbTransaction transaction) [0x00094] in <c093ff03452d49f59d25577493ea2214>:0
at Duplicati.Library.Main.Operation.BackupHandler+<RunAsync>d__19.MoveNext () [0x00e5c] in <c093ff03452d49f59d25577493ea2214>:0
--- End of inner exception stack trace ---
at Duplicati.Library.Main.Operation.BackupHandler+<RunAsync>d__19.MoveNext () [0x01018] in <c093ff03452d49f59d25577493ea2214>:0
---> (Inner Exception #0) System.Exception: 409 - item_name_in_use: Item with the same name already exists
at Duplicati.Library.Main.BackendManager.WaitForComplete (Duplicati.Library.Main.Database.LocalDatabase db, System.Data.IDbTransaction transation) [0x00067] in <c093ff03452d49f59d25577493ea2214>:0
at Duplicati.Library.Main.Operation.FilelistProcessor.UploadVerificationFile (System.String backendurl, Duplicati.Library.Main.Options options, Duplicati.Library.Main.IBackendWriter result, Duplicati.Library.Main.Database.LocalDatabase db, System.Data.IDbTransaction transaction) [0x00094] in <c093ff03452d49f59d25577493ea2214>:0
at Duplicati.Library.Main.Operation.BackupHandler+<RunAsync>d__19.MoveNext () [0x00e5c] in <c093ff03452d49f59d25577493ea2214>:0 <---
---> (Inner Exception #1) System.AggregateException: One or more errors occurred. ---> System.Exception: Unable to find log in lookup table, this may be caused by attempting to transport call contexts between AppDomains (eg. with remoting calls)
at Duplicati.Library.Logging.Log.get_CurrentScope () [0x0004d] in <e74474bd31bc48c3b31b195ac61abde2>:0
at Duplicati.Library.Logging.Log.WriteMessage (Duplicati.Library.Logging.LogMessageType type, System.String tag, System.String id, System.Exception ex, System.String message, System.Object[] arguments) [0x0001e] in <e74474bd31bc48c3b31b195ac61abde2>:0
at Duplicati.Library.Logging.Log.WriteWarningMessage (System.String tag, System.String id, System.Exception ex, System.String message, System.Object[] arguments) [0x00000] in <e74474bd31bc48c3b31b195ac61abde2>:0
at Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess+<>c.<Run>b__1_3 (System.String rootpath, System.String errorpath, System.Exception ex) [0x00000] in <c093ff03452d49f59d25577493ea2214>:0
at Duplicati.Library.Utility.Utility+<EnumerateFileSystemEntries>d__23.MoveNext () [0x001d9] in <5c22135b7083459abdb8767ab6361c3a>:0
at System.Linq.Enumerable+SelectManySingleSelectorIterator`2[TSource,TResult].MoveNext () [0x0006f] in <abeb153532fb46718501a600866a8d76>:0
at Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess+<ExpandWorkList>d__4.MoveNext () [0x000da] in <c093ff03452d49f59d25577493ea2214>:0
at Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess+<>c__DisplayClass1_0+<<Run>b__0>d.MoveNext () [0x00263] in <c093ff03452d49f59d25577493ea2214>:0
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <a6f810169ec746eeb2789b925e2858c0>:0
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0003e] in <a6f810169ec746eeb2789b925e2858c0>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in <a6f810169ec746eeb2789b925e2858c0>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in <a6f810169ec746eeb2789b925e2858c0>:0
at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <a6f810169ec746eeb2789b925e2858c0>:0
at CoCoL.AutomationExtensions+<RunTask>d__10`1[T].MoveNext () [0x000cc] in <6973ce2780de4b28aaa2c5ffc59993b1>:0
--- End of inner exception stack trace ---
---> (Inner Exception #0) System.Exception: Unable to find log in lookup table, this may be caused by attempting to transport call contexts between AppDomains (eg. with remoting calls)
at Duplicati.Library.Logging.Log.get_CurrentScope () [0x0004d] in <e74474bd31bc48c3b31b195ac61abde2>:0
at Duplicati.Library.Logging.Log.WriteMessage (Duplicati.Library.Logging.LogMessageType type, System.String tag, System.String id, System.Exception ex, System.String message, System.Object[] arguments) [0x0001e] in <e74474bd31bc48c3b31b195ac61abde2>:0
at Duplicati.Library.Logging.Log.WriteWarningMessage (System.String tag, System.String id, System.Exception ex, System.String message, System.Object[] arguments) [0x00000] in <e74474bd31bc48c3b31b195ac61abde2>:0
at Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess+<>c.<Run>b__1_3 (System.String rootpath, System.String errorpath, System.Exception ex) [0x00000] in <c093ff03452d49f59d25577493ea2214>:0
at Duplicati.Library.Utility.Utility+<EnumerateFileSystemEntries>d__23.MoveNext () [0x001d9] in <5c22135b7083459abdb8767ab6361c3a>:0
at System.Linq.Enumerable+SelectManySingleSelectorIterator`2[TSource,TResult].MoveNext () [0x0006f] in <abeb153532fb46718501a600866a8d76>:0
at Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess+<ExpandWorkList>d__4.MoveNext () [0x000da] in <c093ff03452d49f59d25577493ea2214>:0
at Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess+<>c__DisplayClass1_0+<<Run>b__0>d.MoveNext () [0x00263] in <c093ff03452d49f59d25577493ea2214>:0
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <a6f810169ec746eeb2789b925e2858c0>:0
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0003e] in <a6f810169ec746eeb2789b925e2858c0>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in <a6f810169ec746eeb2789b925e2858c0>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in <a6f810169ec746eeb2789b925e2858c0>:0
at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <a6f810169ec746eeb2789b925e2858c0>:0
at CoCoL.AutomationExtensions+<RunTask>d__10`1[T].MoveNext () [0x000cc] in <6973ce2780de4b28aaa2c5ffc59993b1>:0 <---
<---
<---
Log data:
2018-06-18 11:43:10 -05 - [Error-Duplicati.Library.Main.Operation.BackupHandler-FatalError]: Fatal error
System.Exception: 409 - item_name_in_use: Item with the same name already exists
at Duplicati.Library.Main.BackendManager.WaitForComplete (Duplicati.Library.Main.Database.LocalDatabase db, System.Data.IDbTransaction transation) [0x00067] in <c093ff03452d49f59d25577493ea2214>:0
at Duplicati.Library.Main.Operation.FilelistProcessor.UploadVerificationFile (System.String backendurl, Duplicati.Library.Main.Options options, Duplicati.Library.Main.IBackendWriter result, Duplicati.Library.Main.Database.LocalDatabase db, System.Data.IDbTransaction transaction) [0x00094] in <c093ff03452d49f59d25577493ea2214>:0
at Duplicati.Library.Main.Operation.BackupHandler+<RunAsync>d__19.MoveNext () [0x00e5c] in <c093ff03452d49f59d25577493ea2214>:0
I was able to run two backup versions to box.com despite this error, but now the error seems to be stopping any additional backups from happening.