Files.copy() error

Copy File from: '/home/domisum/PPRPGCI/builds/gameServer/bukkit.yml' dest: '/home/domisum/gameServer01/bukkit.yml'
Exception in thread "main" java.lang.ExceptionInInitializerError
        at java.nio.file.FileSystems.getDefault(FileSystems.java:176)
        at java.io.File.toPath(File.java:2234)
        at io.github.domisum.pprpgserverupdater.util.FileUtil.copyFile(FileUtil.java:154)
        at io.github.domisum.pprpgserverupdater.util.FileUtil.copyDirectory(FileUtil.java:169)
        at io.github.domisum.pprpgserverupdater.PPRPGServerUpdater.<init>(PPRPGServerUpdater.java:74)
        at io.github.domisum.pprpgserverupdater.PPRPGServerUpdater.main(PPRPGServerUpdater.java:38)
Caused by: java.security.PrivilegedActionException: sun.nio.fs.UnixException: No such file or directory
        at java.security.AccessController.doPrivileged(Native Method)
        at java.nio.file.FileSystems$DefaultFileSystemHolder.defaultFileSystem(FileSystems.java:96)
        at java.nio.file.FileSystems$DefaultFileSystemHolder.<clinit>(FileSystems.java:90)
        ... 6 more
Caused by: sun.nio.fs.UnixException: No such file or directory
        at sun.nio.fs.UnixNativeDispatcher.getcwd(Native Method)
        at sun.nio.fs.UnixFileSystem.<init>(UnixFileSystem.java:67)
        at sun.nio.fs.LinuxFileSystem.<init>(LinuxFileSystem.java:39)
        at sun.nio.fs.LinuxFileSystemProvider.newFileSystem(LinuxFileSystemProvider.java:46)
        at sun.nio.fs.LinuxFileSystemProvider.newFileSystem(LinuxFileSystemProvider.java:39)
        at sun.nio.fs.UnixFileSystemProvider.<init>(UnixFileSystemProvider.java:56)
        at sun.nio.fs.LinuxFileSystemProvider.<init>(LinuxFileSystemProvider.java:41)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at java.lang.Class.newInstance(Class.java:442)
        at sun.nio.fs.DefaultFileSystemProvider.createProvider(DefaultFileSystemProvider.java:48)
        at sun.nio.fs.DefaultFileSystemProvider.create(DefaultFileSystemProvider.java:63)
        at java.nio.file.FileSystems$DefaultFileSystemHolder.getDefaultProvider(FileSystems.java:108)
        at java.nio.file.FileSystems$DefaultFileSystemHolder.access$000(FileSystems.java:89)
        at java.nio.file.FileSystems$DefaultFileSystemHolder$1.run(FileSystems.java:98)
        at java.nio.file.FileSystems$DefaultFileSystemHolder$1.run(FileSystems.java:96)
        ... 9 more