The exception from the log is:
ERROR o.c.ui.controllers.UnlockController - Unlock failed for technical reasons.
org.cryptomator.ui.model.Volume$VolumeException: Unable to mount Filesystem
at org.cryptomator.ui.model.DokanyVolume.mount(DokanyVolume.java:56)
at org.cryptomator.ui.model.Vault.unlock(Vault.java:115)
at org.cryptomator.ui.controllers.UnlockController.lambda$didClickUnlockButton$0(UnlockController.java:494)
at org.cryptomator.ui.util.Tasks.lambda$create$0(Tasks.java:33)
at org.cryptomator.ui.util.Tasks$TaskImpl.call(Tasks.java:139)
at javafx.concurrent.Task$TaskCallable.call(Task.java:1425)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: org.cryptomator.frontend.dokany.MountFailedException: java.lang.IllegalStateException: Mount failed: Cannot install driver.
at org.cryptomator.frontend.dokany.MountFactory.mount(MountFactory.java:128)
at org.cryptomator.ui.model.DokanyVolume.mount(DokanyVolume.java:51)
... 11 common frames omitted
Caused by: java.lang.IllegalStateException: Mount failed: Cannot install driver.
at com.dokany.java.DokanyDriver.start(DokanyDriver.java:65)
... 5 common frames omitted
The same error has been reported before, in this thread as well as on GitHub.
Can you follow @infeo’s instructions given on GitHub to make sure, your Dokany installation is in order?