What causes side-by-side configuration errors at game launch?

The manifest-declared runtime assemblies cannot be resolved — corrupted VC++ runtime registrations (the classic source for older games), or manifest/DLL mismatches in what shipped.

How do I catch this when it only happens for some players?

Capture it automatically from the player's device with the full stack trace, the device and OS, the build, and a breadcrumb trail of what they did. That turns a vague complaint into a specific, reproducible issue you can fix without owning the hardware it happens on.

How to Fix “The application has failed to start because its side-by-side configuration is incorrect” for Games

Quick answer: Have players reinstall/repair the exact VC++ redistributables the game needs (sxstrace names them), and modernize builds off legacy SxS runtimes where possible.

SxS errors are manifest resolution failures — Windows knows exactly which assembly it could not satisfy and will tell you via sxstrace. Mostly a legacy-runtime story. Here is the drill.

How to fix it

1. Name the assembly with sxstrace

sxstrace trace + reproduce + sxstrace parse outputs which assembly/version failed — turning the vague dialog into 'VC90 CRT x86 missing', which is fixable in one install.

2. Repair the named runtime

Install/repair the specific redistributable (2005/2008-era for old titles, matching architecture) — modern 2015+ runtimes don't use SxS this way, so this error usually means an older dependency.

3. Check what you shipped

If your build embeds manifests referencing runtime versions you did not bundle or require, align the manifest, the shipped DLLs, and the installer's redist step.

4. Modernize when maintaining

Rebuilding legacy projects with current toolchains moves them off registry-registered SxS entirely — worth it for titles still selling and generating these tickets.

Catching the ones you can't reproduce

The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.

Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.

This is where a tool like Bugnet earns its place. Its SDK captures every error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.

Ship the fix, watch the signature disappear from the next build. That's how you know it's really gone.