R2ModManPlus Game Crash After Mod Install

Table of Contents

Introduction

A game crash immediately after installing mods through R2ModManager Plus is one of the most common and disruptive problems in the modding workflow. It can occur after installing a single mod, after a batch install, or even after updating an existing mod to a newer version.

Most crashes in this scenario are not random. They follow identifiable patterns rooted in mod conflicts, framework version mismatches, missing dependencies, or incompatible mod versions relative to the current game build.

Quick Answer about R2ModManPlus Game Crash

A crash after mod install is almost never caused by R2ModMan Plus itself but by the installed mod or its interaction with other mods
The most reliable first diagnostic step is checking the BepInEx log file generated at the last launch attempt
Missing or mismatched dependencies are the single most common cause of crashes following a new mod installation
Disabling all newly installed mods and reenabling them one at a time isolates the specific mod causing the crash
An outdated BepInEx or MelonLoader framework version causes crashes that appear identical to mod-specific conflicts but require a different fix
Mod configuration files left from a previous mod version can conflict with a newly installed version and trigger crashes on load
Not all mods are compatible with each other even when both are individually stable and up to date
Crashes occurring at the main menu differ from crashes at launch and indicate different failure points in the mod loading chain
Always update the mod framework before updating or installing individual mods after a game patch

What Causes Game Crashes After Mod Installation

Crashes after mod installation follow a predictable set of root causes. Each cause produces slightly different crash behavior that helps narrow down the source before spending time on trial and error.

Understanding the failure categories makes the diagnostic process faster and more systematic.

Mod Conflicts, Dependencies, and Version Mismatches

The majority of post-install crashes fall into three overlapping categories.

Mod conflicts occur when two installed mods attempt to modify the same game system in incompatible ways. Neither mod is broken individually but their combined effect on the game’s code creates an unhandled exception that crashes the process.

Missing dependencies occur when a mod requires another mod or framework package to be present and that package is either absent or at an incompatible version. The dependent mod attempts to call functions or access resources from the missing package and fails immediately.

Version mismatches occur when a mod was built against a specific game version and the current installed game version has changed enough to break the mod’s assumptions about the game’s code structure.

Each category requires a different fix despite producing similar crash symptoms.

How the BepInEx Log Identifies the Crash Source

The BepInEx log file is the most important diagnostic tool available after a crash. It records every step of the framework initialization and mod loading process, including the exact point where a failure occurred.

Location of the BepInEx log file:

On Windows the log is at [GameDirectory]\BepInEx\LogOutput.log

On Linux through Steam Proton it is within the game’s compatdata prefix at the equivalent BepInEx path.

What to look for in the log file:

Lines beginning with [Error] or [Fatal] indicate the failure point
The mod name listed immediately before the first error line is frequently the source of the crash
Dependency missing errors appear as explicit messages stating a required assembly or package could not be found
Stack trace sections below an error line show the exact code path that failed

Reading the log from the first error line downward rather than from the bottom up gives a clearer picture of the failure sequence.

How to Diagnose Which Mod Is Causing the Crash

Systematic diagnosis prevents the common mistake of removing all mods and reinstalling everything from scratch when only one mod is responsible for the crash.

A structured isolation process identifies the problem mod with minimal disruption to the rest of the configuration.

The Bisect Method for Isolating Problem Mods

The bisect method divides the installed mod list into halves and systematically eliminates groups until the problem mod is identified.

Bisect isolation steps:

Open R2ModMan Plus and navigate to the installed mod list for the affected profile
Disable half of the installed mods using the toggle switches next to each mod
Launch the game through R2ModManager Plus using Start Modded
If the game launches without crashing, the problem mod is in the disabled half
If the game still crashes, the problem mod is in the enabled half
Repeat the halving process on the identified half until a single mod is confirmed as the crash source
Once identified, check that mod’s Thunderstore page for known compatibility issues or required updates

The bisect method is significantly faster than disabling mods one at a time when the installed list contains more than ten mods.

Checking Dependency Installation and Framework Version

Before running the bisect process, verify two baseline conditions that cause crashes independently of specific mod conflicts.

Dependency verification steps:

Open the installed mod list in R2ModMan Plus
Look for any mods showing a warning indicator or flagged as having unmet dependencies
Install any missing dependency packages listed by R2ModManager Plus before attempting another launch
Verify that BepInEx or the applicable framework is installed and listed in the profile’s mod list
Check the framework version against the current game build requirements

Framework version verification:

Navigate to the Thunderstore mod browser within R2ModMan Plus
Search for BepInEx or the applicable framework for the affected game
Compare the installed version against the latest available version
Update the framework if a newer version is available before testing individual mods

Common Problems and Solutions:

Game crashes at launch with no BepInEx console appearing BepInEx is not installed in the active profile or the framework version is incompatible with the current game build; reinstall BepInEx through R2ModMan Plus
Crash occurs after the main menu loads the framework is functioning but a specific mod is failing during game initialization; use the bisect method to isolate the mod
Crash only occurs when entering a specific game area a content-modifying mod is conflicting with that area’s assets; check recently installed content mods targeting that area
Game crashes after updating a mod the new version introduced a conflict or the update changed a dependency requirement; roll back the updated mod to the previous version using R2ModMan Plus
BepInEx log shows no errors but game still crashes the crash is occurring outside BepInEx’s logging scope, possibly in a MelonLoader mod or a native code plugin; check for native plugin compatibility notes on the mod’s Thunderstore page
Crash only occurs with a specific combination of two mods a direct mod conflict exists between those two mods; check both mods’ pages for known incompatibility notices and contact the mod authors if none are documented

Fixing the Crash Once the Problem Mod Is Identified

Identifying the problem mod is only the first step. The fix depends on why that specific mod is causing the crash rather than simply removing it permanently.

Updating, Rolling Back, or Replacing the Problem Mod

Once the problem mod is isolated, check its Thunderstore page for recent updates, known issues, or compatibility notices before deciding on a fix approach.

If the mod has a recent update available:

Update the mod through R2ModMan Plus and test the launch again. Developers frequently push hotfix updates within days of a game patch that resolve crash-causing compatibility issues.

If the mod was recently updated and the crash began after that update:

Roll back to the previous version using R2ModMan Plus’s version selection feature.

Locate the mod in the installed list
Select the version dropdown or version history option
Choose the previous stable version from the available list
Confirm the downgrade and test the launch

If the mod has not been updated for an extended period:

The mod may be abandoned or the developer may be unaware of the compatibility issue. Check the mod’s GitHub repository or Thunderstore comments for community-maintained forks that address the compatibility problem.

Resolving Dependency Conflicts Between Mods

When two mods require different versions of the same dependency package, R2ModMan Plus may install one version that satisfies one mod but breaks the other.

Steps to resolve dependency version conflicts:

Identify which dependency package is involved by reading the BepInEx log error messages
Check each conflicting mod’s declared dependency version on their Thunderstore pages
Determine whether a version of the dependency exists that satisfies both mods simultaneously
If a compatible version exists, manually select it through R2ModMan Plus’s version management for that dependency package
If no compatible version exists, one of the conflicting mods must be removed until the developer updates the dependency declaration

Dependency conflicts are more common during the period immediately following a game patch when some mods have updated their dependency requirements and others have not yet followed.

After resolving any crash:

Export a profile code immediately to preserve the working configuration
Note which mod caused the crash and its version in a personal reference document
Monitor that mod’s update page for future releases that may reintroduce the conflict after subsequent game patches

Frequently Asked Questions

Where is the BepInEx log on Windows?

The BepInEx log is at [GameDirectory]\BepInEx\LogOutput.log. Open the game’s installation folder, navigate into the BepInEx subfolder, and open LogOutput.log with any text editor. This file is overwritten at each launch so review it immediately after a crash before launching again.

How do I disable one mod in R2ModManPlus?

Open R2ModMan Plus, select the affected profile, and navigate to the installed mod list. Each mod has a toggle switch on its left side. Click the toggle to disable a specific mod without uninstalling it. Disabled mods remain installed but are excluded from the next launch.

Can two mods crash without either being broken?

Yes. Two individually stable mods can conflict when loaded together if they modify the same game system in incompatible ways. Neither mod is at fault independently. Check both mods’ pages for documented incompatibilities and contact the authors if none are listed.

What does a missing dependency crash look like?

A missing dependency crash produces a clear error in the BepInEx log referencing a specific assembly or package that could not be loaded. The error typically appears near the top of the log output immediately after framework initialization. Install the missing package through R2ModMan Plus to resolve it.

Does rolling back a mod delete my settings?

Rolling back a mod version in R2ModMan Plus reinstalls the mod files at the previous version but does not automatically delete the mod’s configuration file in the BepInEx config folder. Configuration files from newer versions may cause unexpected behavior with older mod versions and should be deleted and regenerated if issues persist after a rollback.

Why does my game crash only in one area?

A crash in a specific game area typically indicates a content mod conflicting with that area’s assets rather than a framework-level failure. Disable content mods targeting that area using the bisect method to identify the specific mod responsible.

How do I update BepInEx in R2ModManPlus?

Open R2ModMan Plus and navigate to the installed mod list for the affected profile. Locate BepInEx in the list and check for an available update indicator. Click update to install the latest version. Always update BepInEx before updating or installing individual mods after a game patch.

Can R2ModManPlus itself cause game crashes?

R2ModMan Plus is a management tool and does not run during gameplay. It injects the mod framework at launch but does not remain active during the game session. Crashes during gameplay are caused by mods or framework compatibility issues rather than by R2ModMan Plus itself.

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