me.lucko.luckperms.common.commands.misc.ImportCommand.execute(ImportCommand.java:73)
[17:41:13] [Craft Scheduler Thread - 6/WARN]: at me.lucko.luckperms.common.commands.SingleCommand.execute(SingleCommand.java:46)
[17:41:13] [Craft Scheduler Thread - 6/WARN]: at me.lucko.luckperms.common.commands.SingleCommand.execute(SingleCommand.java:34)
[17:41:13] [Craft Scheduler Thread - 6/WARN]: at me.lucko.luckperms.common.commands.CommandManager.onCommand(CommandManager.java:152)
[17:41:13] [Craft Scheduler Thread - 6/WARN]: at me.lucko.luckperms.common.commands.CommandManager.lambda$onCommand$1(CommandManager.java:98)
[17:41:13] [Craft Scheduler Thread - 6/WARN]: at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftTask.run(CraftTask.java:71)
[17:41:13] [Craft Scheduler Thread - 6/WARN]: at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:52)
[17:41:13] [Craft Scheduler Thread - 6/WARN]: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
[17:41:13] [Craft Scheduler Thread - 6/WARN]: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[17:41:13] [Craft Scheduler Thread - 6/WARN]: at java.lang.Thread.run(Thread.java:745)
[17:41:13] [Craft Scheduler Thread - 6/INFO]: [LP] An unexpected error occured whilst reading from the log file.

Need the rest of that stacktrace, please. (there should be output above that)

Looks like the plugin was unable to open and read the log file. It varies platform to platform, but sometimes there's an issue if the file is opened in another process.

Please reopen if the error occurs again.