Error Code Help

I'm getting this error code, dont know what it means or what to do

java.lang.RuntimeException: java.nio.file.FileSystemException: C:\ProgramData\FAForever\gamedata\meshes.nx2: The process cannot access the file because it is being used by another process
at com.faforever.client.patch.SimpleHttpFeaturedModUpdaterTask.lambda$call$0(SimpleHttpFeaturedModUpdaterTask.java:94)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
at com.faforever.client.patch.SimpleHttpFeaturedModUpdaterTask.call(SimpleHttpFeaturedModUpdaterTask.java:70)
at com.faforever.client.patch.SimpleHttpFeaturedModUpdaterTask.call(SimpleHttpFeaturedModUpdaterTask.java:29)
at javafx.concurrent.Task$TaskCallable.call(Task.java:1426)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.nio.file.FileSystemException: C:\ProgramData\FAForever\gamedata\meshes.nx2: The process cannot access the file because it is being used by another process
at java.base/sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:92)
at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103)
at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108)
at java.base/sun.nio.fs.WindowsFileCopy.copy(WindowsFileCopy.java:171)
at java.base/sun.nio.fs.WindowsFileSystemProvider.copy(WindowsFileSystemProvider.java:284)
at java.base/java.nio.file.Files.copy(Files.java:1305)
at com.faforever.client.io.FeaturedModFileCacheService.copyFeaturedModFileFromCache(FeaturedModFileCacheService.java:64)
at com.faforever.client.patch.SimpleHttpFeaturedModUpdaterTask.lambda$call$0(SimpleHttpFeaturedModUpdaterTask.java:89)
... 8 more

The process cannot access the file because it is being used by another process:
This can be:

• a hanging client instance that wasn't closed properly
• a still running game
• a retarded AntiVirus

For 1) and 2) you either manually kill the process in the task manager or restart your PC.
For 3) you disable your antivirus, configure it correctly or consider that additional AntiVirus in 2022 is useless (Microsoft Defender offers the same level of security)