[TaCZ] Runtime Compat
Custom TaCZ gun packs that break in large modpacks can be repaired at load time by [TaCZ] Runtime Compat, a NeoForge utility for 1.21.1.
What it does
Certain gun packs ship with resource paths that stricter loading rules reject. Small setups usually load them without trouble, but large modpacks can hit errors such as invalid resource path messages. [TaCZ] Runtime Compat corrects these problems while the game is running, so custom TaCZ guns load and function correctly even in big modpacks.
The mod requires TaCZ Pack Upgrader and the [UNOFFICIAL] TaCZ 1.21.1 NeoForge Port, both of which must be installed alongside it. Gun packs are placed in the tacz folder as usual, and setup happens automatically. The mod adds no new content of its own; its only purpose is to make custom guns work smoothly. A server running it needs every connecting player to have it too.
The project is published for NeoForge on 1.21.1 only, with the latest file 1.0.1 dated 2026-05-27. The code is not open source; it is covered by a custom license.
Key features
Invalid resource path fixes
Repairs resource paths in custom gun packs that would otherwise fail under stricter loading rules.
Runtime correction
Corrections are applied while the game runs, so packs need no manual editing before they load.
Large modpack support
Targets errors that appear only when many gun packs and mods are loaded together.
Automatic setup
After installation, the setup needed for custom gun packs is handled without manual configuration.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 2
Use cases
Large modpacks with custom guns
Modpacks that bundle many custom TaCZ gun packs can use this mod to avoid load errors from invalid resource paths.
Small setups
Players running a few gun packs on a simple setup are unlikely to need it, since those packs usually load without errors.
Who it’s for: Players and server owners who run custom TaCZ gun packs in large modpacks, especially where invalid resource path errors appear at startup.
How it compares
TaCZ Chamber Clarity: Reloaded is a NeoForge 1.21.1 mod that only the client needs, and it is not open source under All rights reserved, so it does not touch servers. Sable/Leawind compat is also NeoForge 1.21.1 and needs only the client, released under the MIT License. TaCZ addon covers Forge and NeoForge 1.20 – 1.21.1, where servers and players both run it, under the GNU General Public License v3.0 only.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| [TaCZ] Runtime Compat | NeoForge | 1.21.1 | Client and server | 2026-05-27 |
| TaCZ addon | Forge and NeoForge | 1.20 – 1.21.1 | Client and server | 2026-10-05 |
| TaCZ Chamber Clarity: Reloaded | NeoForge | 1.21.1 | Client-side only | 2026-07-09 |
| Sable/Leawind compat | NeoForge | 1.21.1 | Client-side only | 2026-04-30 |
Questions
Does Runtime Compat need TaCZ Pack Upgrader?
Does the server need Runtime Compat?
Which game versions are supported?
Does Runtime Compat add new guns?
In the catalog
[TaCZ] Runtime Compat is one of 36,990 Utility mods on ModsFinder, and one of 13,477 Utility mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
More from Aritsiaserlet
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What the author says
"net.minecraft.resourceLocationException: Non [a-z0-9/._-] character in path of location: tacz:gun" This happens because some custom gun packs contain invalid resource paths that break under stricter loading conditions.
Official listing
- Modrinth page
- modrinth.com/mod/tacz-runtime-compat
- Owner
- Aritsiaserlet
- Published
- 2026-05-19
- Updated on Modrinth
- 2026-05-27
- Facts verified
- 2026-10-15