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March 22, 2026
ModWorks Team

GTA V ERR_FIL_PACK Fix: Crash Error Guide for Modders

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What ERR_FIL_PACK Errors Mean

ERR_FIL_PACK errors occur when GTA V's file system detects a problem while reading RPF archives or individual game files during loading. The game can't continue loading and crashes to desktop with an error dialog.

These errors are almost always caused by modding — specifically, by corrupted archives, incorrectly replaced files, or file size mismatches. If you see one of these errors on a completely unmodded game, your installation is likely damaged and needs to be verified through your game launcher.

The number after ERR_FIL_PACK indicates which specific check failed. Each variant points to a different root cause.

ERR_FIL_PACK_1

What It Means

The game detected that an RPF archive's internal structure doesn't match what it expected. The table of contents, entry count, or header data is invalid.

Common Causes

  • Corrupted RPF file. The archive was damaged during modification, incomplete download, or a crash during writing. This is the most frequent cause.
  • Wrong game version. An RPF file from a different version of GTA V (e.g., Legacy Edition RPF used in Enhanced Edition, or vice versa).
  • Incomplete mod installation. The RPF was partially modified — the tool crashed or was closed before finishing the write operation.

How to Fix

  1. Restore from backup. If you have a backup of the RPF file from before modding, replace the corrupted file with it.
  2. Verify game files. Use Steam, Epic, or the Rockstar Launcher to verify the integrity of your game files. This restores any modified base game RPFs to their original state.
  3. If using a mods folder: Delete the corrupted RPF from the mods/ folder. The game will fall back to the original in the base game directory.
  4. Redownload the mod. If the RPF came from a mod download, get a fresh copy. The original download may have been corrupted.

ERR_FIL_PACK_3

What It Means

A file inside an RPF archive has a size mismatch — the entry's metadata says the file should be a certain size, but the actual data is different. This causes a read error when the game tries to load that specific file.

Common Causes

  • Manual file replacement gone wrong. Replacing a file inside an RPF without properly updating the archive's entry table.
  • Texture or model too large. A replacement file that significantly exceeds the original's size, and the tool didn't correctly repack the archive.
  • Tool bug. Older versions of some modding tools occasionally produce RPFs with incorrect size entries.

How to Fix

  1. Re-replace the file. Open the RPF in ModWorks, remove the problematic replacement, and re-import the modified file. ModWorks recalculates all size entries automatically.
  2. Check replacement file sizes. If you replaced a 500KB texture with a 20MB one, the archive may not repack correctly. Optimize the replacement file first.
  3. Rebuild the archive. Some tools offer an option to rebuild or repack the entire RPF, which recalculates all entries from scratch.

ERR_FIL_PACK_5

What It Means

The game encountered an encryption or decryption error while reading an RPF archive. The file is encrypted but the decryption produced invalid data, or an unencrypted file was treated as encrypted.

Common Causes

  • Encryption mismatch. A tool wrote the RPF with one encryption type but set the header flags for a different type.
  • Mixing encrypted and unencrypted RPFs. Copying an unencrypted RPF into a location where the game expects an encrypted one (or vice versa).

How to Fix

  1. Use a tool that handles encryption correctly. ModWorks auto-detects encryption type from header flags and handles AES and NG encryption variants.
  2. Don't manually copy RPFs between game editions. Legacy and Enhanced editions may use different encryption.
  3. Restore and re-modify. Start fresh — restore the original RPF, then apply your modifications again with a reliable tool.

ERR_FIL_PACK_2 and Other Variants

Less common variants typically indicate:

  • ERR_FIL_PACK_2 — Decompression failure. A compressed entry inside the RPF couldn't be decompressed. The raw deflate data is corrupted or the compression flags are wrong.
  • ERR_FIL_PACK_4 — Read error. The game couldn't read the file at all — possibly a disk error, permissions issue, or the file is locked by another process.

The fix for all variants follows the same pattern: restore the original file and re-apply modifications.

ERR_FIL Errors Beyond ERR_FIL_PACK

There are related errors that aren't specifically ERR_FIL_PACK but appear in similar situations:

ERR_FIL_SIZE_1 / ERR_FIL_SIZE_3

The game's streaming system ran out of memory trying to load too many assets. This isn't a corrupt file — it's a capacity problem.

Fix: Install an updated gameconfig.xml with increased pool sizes and streaming memory. The default gameconfig is designed for the base game, not heavy modding. Community gameconfigs raise limits for entities, vehicles, streaming memory, and other pools.

ERR_MEM_MULTIALLOC_FREE

Related to memory allocation. Usually caused by too many high-resolution textures loaded simultaneously.

Fix: Optimize your textures. Reduce dimensions on oversized textures, especially those over 2048x2048. If running FiveM, see our YTD optimization guide.

ERR_GEN_ZLIB_2

Decompression failure outside of RPF context. A standalone compressed file (not inside an RPF) has corrupted compression data.

Fix: Re-extract or redownload the affected file.

Diagnosing Which File Causes the Error

The error dialog usually doesn't tell you which specific file caused the problem. To narrow it down:

  1. Check what you changed last. If the error appeared after installing a specific mod, that mod is the likely culprit.
  2. Use binary search. If you have many mods, remove half of them and test. If the error persists, the problem is in the remaining half. Keep halving until you find the specific mod.
  3. Check your mods folder. Remove the entire mods/ folder temporarily. If the error disappears, one of your modified RPFs is the cause. Add them back one at a time.
  4. Read crash logs. GTA V sometimes writes more details to log files. ModWorks includes a crash analyzer that parses dump files and identifies the last file the game was trying to load before the crash.

Prevention

  • Always use a mods folder so original game files stay untouched
  • Back up RPFs before modifying — keep the last known working version
  • Use reliable tools that properly handle encryption, compression, and size entries
  • Don't exceed streaming limits — use an updated gameconfig.xml
  • Verify game files after updates — game patches can invalidate modified RPFs
  • Test after each mod — installing everything at once makes it impossible to identify which mod caused a problem

FiveM-Specific Notes

FiveM handles file loading differently from single-player. ERR_FIL_PACK errors on FiveM usually mean:

  • A streamed asset in a resource is corrupted
  • A meta file has invalid XML syntax
  • The fxmanifest.lua references files that don't exist or are in the wrong location

Check the FiveM server console output — it often provides more specific error messages than the client crash dialog. If the error only happens on your server, the issue is in your resources, not the client's game files.

Further Reading