Make sure User Account Control is off or set to “low” in Control Panel. The UAC dialogue box with full screen transparency is known to cause the game to crash.

Contact a server administrator or developer. There is a reference to an asset path which does not exist.

• Symptoms: Often no issues until 20 minutes or maybe 2 hours of playing then eventually it starts to lag and jitter. Moving the mouse often seems to cause or make the problem worse.

• Solution: In task manager kill or end the processes for NVIDIA Container or NvContainer or nvcontainer.exe

  note: https://www.google.com/search?q=nvidia+nvcontainer+fps+lag

• Permanent Solution: the solution mentioned above solves the issue until the computer is restarted or rebooted. To prevent it from coming back the service needs to be disabled and removed from startup.

• Symptoms: Specific maps may have issues. BM(Beast’s Mountain) and OCL(Outcast’s Land) in particular.
• Solution: There is usually “de-lagged” versions of the maps available.
  • Our “De-lagged” version of BM/OCL
  • Our “Default” version of BM/OCL

• Anti-virus software often causes this issue .
• Most launchers check to make sure RF_Online.bin is not already running to prevent players from logging in more than once per computer.

• Anti-virus software often causes this issue. 
• Sometimes this happens just because of a communications error. Just retry.