Hi, what could be the problem?
I just lost a few hours of work. Backups is too early.

Here a logs:
Spine Launcher 3.4.04
Mac OS X x86_64 10.11.6
Java 1.7.0_51 Esoteric Software
64-bit Server VM
Up to date: Spine 3.5.26
Spine 3.5.26 Professional
Intel Inc.
Intel HD Graphics 4000 OpenGL Engine
2.1 INTEL-10.14.73
Started.
Error loading project: /Users/rodendron/WRK/hg_client/assets/spines/ground/ground.spine
java.lang.NullPointerException
at kE.a(SourceFile:195)
at kl.a(SourceFile:27)
at kE.a(SourceFile:125)
at kl.a(SourceFile:22)
at kJ.b(SourceFile:319)
at zU.b(SourceFile:522)
at zU.i(SourceFile:377)
at rH.a(SourceFile:598)
at com.esotericsoftware.spine.editor.Editor.a(SourceFile:531)
at ad.a(SourceFile:185)
at lV.a(SourceFile:86)
at ad.a(SourceFile:180)
at ae.run(SourceFile:89)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
java.nio.file.AccessDeniedException: /.DocumentRevisions-V100
at sun.nio.fs.UnixException.translateToIOException(UnixException.java:84)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
at sun.nio.fs.UnixFileSystemProvider.newDirectoryStream(UnixFileSystemProvider.java:406)
at java.nio.file.Files.newDirectoryStream(Files.java:411)
at sun.nio.fs.PollingWatchService$PollingWatchKey.<init>(PollingWatchService.java:258)
at sun.nio.fs.PollingWatchService.doPrivilegedRegister(PollingWatchService.java:167)
at sun.nio.fs.PollingWatchService.access$000(PollingWatchService.java:45)
at sun.nio.fs.PollingWatchService$2.run(PollingWatchService.java:130)
at sun.nio.fs.PollingWatchService$2.run(PollingWatchService.java:127)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.fs.PollingWatchService.register(PollingWatchService.java:126)
at sun.nio.fs.UnixPath.register(UnixPath.java:897)
at sun.nio.fs.AbstractPath.register(AbstractPath.java:104)
at EG.a(SourceFile:208)
at EG.a(SourceFile:224)
at Ez.run(SourceFile:147)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)

I sent you an email.

Thank you so much!