Not able to login to Nomachine freenx 4

After upgrading freenx from 3.5 to 4, I have connection problems
Freenx server gives me this error:
20:23:05:688.269 NXSERVER-4.0.352[21445] WARNING: Cannot open: /usr/NX/var/db/node/hostinfo No such file or directory
20:23:05:694.122 NXSERVER-4.0.352[21445] WARNING: Cannot open: /usr/NX/etc/cluster.db No such file or directory
20:23:06:144.563 NXSERVER-4.0.352[21466] WARNING: Cannot open: /usr/NX/var/db/node/hostinfo No such file or directory
20:23:07:536.767 NXSERVER-4.0.352[21881] WARNING: Cannot open: /usr/NX/var/db/node/hostinfo No such file or directory
20:23:07:970.563 NXSERVER-4.0.352[21890] WARNING: Cannot open: /usr/NX/var/db/node/hostinfo No such file or directory
20:23:08:159.609 NXSERVER-4.0.352[21890] Starting NoMachine server and services.
20:24:13:350.990 NXSERVER-4.0.352[22091] WARNING: Cannot open: /usr/NX/etc/server.lic Permission denied
20:24:13:396.557 NXSERVER-4.0.352[22087] WARNING: Cannot open: /usr/NX/etc/server.lic Permission denied
20:24:13:398.991 NXSERVER-4.0.352[22086] WARNING: Cannot open: /usr/NX/etc/server.lic Permission denied
20:24:19:048.803 NXSERVER-4.0.352[22128] WARNING: Cannot open: /usr/NX/etc/server.lic Permission denied
20:24:39:852.287 NXSERVER-4.0.352[22150] WARNING: Cannot open: /usr/NX/etc/server.lic Permission denied
20:24:39:852.691 NXSERVER-4.0.352[22155] WARNING: Cannot open: /usr/NX/etc/server.lic Permission denied
20:24:39:854.334 NXSERVER-4.0.352[22151] WARNING: Cannot open: /usr/NX/etc/server.lic Permission denied
20:24:57:639.669 NXSERVER-4.0.352[22251] WARNING: Cannot open: /usr/NX/etc/server.lic Permission denied
20:24:57:640.631 NXSERVER-4.0.352[22255] WARNING: Cannot open: /usr/NX/etc/server.lic Permission denied
20:24:57:642.993 NXSERVER-4.0.352[22252] WARNING: Cannot open: /usr/NX/etc/server.lic Permission denied
20:34:27:270.237 NXSERVER-4.0.352[22383] Shutting down NoMachine server and services.
20:34:27:405.643 NXSERVER-4.0.352[22383] WARNING: Cannot open: /usr/NX/var/db/running/sessionId{9A1C6A367C092F22AD8F2C3763BA8D48} No such file or directory
20:34:27:430.803 NXSERVER-4.0.352[22383] WARNING: Cannot open file '/usr/NX/var/db/running/sessionId{9A1C6A367C092F22AD8F2C3763BA8D48}' for reading: No such file or directory.
20:34:27:595.991 NXSERVER-4.0.352[22383] Starting NoMachine server and services.
20:36:13:868.332 NXSERVER-4.0.352[22538] Shutting down NoMachine server and services.
Missing log level from: (main, (eval 1), 9408, main::mark_session_dir_as_terminated) and message Cannot rename directory '/home/david/.nx/C-SERVER-0-C55D94F9A19EB8D4C9D5403F769A8B99' moved into '/home/david/.nx/T-C-SERVER-0-C55D94F9A19EB8D4C9D5403F769A8B99': No such file or directory20:36:19:180.192 NXSERVER-4.0.352[22538] WARNING: Cannot open: /usr/NX/var/db/running/sessionId{C55D94F9A19EB8D4C9D5403F769A8B99} No such file or directory
20:36:19:202.685 NXSERVER-4.0.352[22538] WARNING: Cannot open file '/usr/NX/var/db/running/sessionId{C55D94F9A19EB8D4C9D5403F769A8B99}' for reading: No such file or directory.
10:36:54:468.304 NXSERVER-4.0.352[2143] Starting NoMachine server and services.

 Do your guys have a solution to fix this?