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Unity IL2CPP build dies with il2cpp.exe did not run properly: the C++ toolchain the Editor never told you it needed

Problem The Mono build of the game succeeds every time. Switching the player to IL2CPP (`Player Settings > Other Settings > Scripting Backend > IL2CPP`) — required for iOS, and the sane choice for a Steam release — fails within a minute:…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything

Unity NullReferenceException on a field you assigned in the Inspector: the reference that only exists in one scene

Problem Every Unity developer has seen this one, and the confusing part is that the field **is** assigned in the Inspector: The component the exception comes from reads like this — with the serialized field assigned: The exception only fires from…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything

Docker build ignores your code changes: COPY is cacheable and apt-get is hiding behind it

Problem We changed the install script in the Dockerfile, rebuilt, and the new image behaved identically to the old one. The build log showed: `--no-cache` "fixed" it and added 6 minutes to every build. Nobody wanted to admit the real bug: the layer…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything

Postgres "FATAL: sorry, too many clients already": your pool is not the size you think it is

Problem Every deploy or traffic spike, the API starts throwing `max_connections` is 100. Our pg pool is configured to 20. The math never worked out, so someone doubled the pool size — which made it worse, faster. Root cause Count what actually holds…

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Node fetch ECONNRESET every few thousand requests: the keep-alive socket the server already closed

Problem A Node 20 worker calling one upstream API a few hundred thousand times a day: every few thousand requests, `fetch` dies with It is load-correlated — more traffic, more resets — and retrying by hand always succeeds, which smells like a bug in…

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psql "FATAL: password authentication failed for user": when the password is actually right

Problem Connecting with psql: The password is copied straight from the deploy platform's environment variable. It works for one teammate and fails for two others. Everyone was blaming the password rotation; nobody had typed it wrong. Root cause…

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TS2307 "Cannot find module": the five causes, ranked by how long they take to find

Problem Works in the editor, fails in `tsc` — or the reverse. Or it compiles fine locally and fails in CI. All three happened to us in one week, so we mapped every cause. Root cause TS2307 means TypeScript's module resolution found nothing. The five…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything

CrashLoopBackOff: read the exit code before you touch the YAML

Problem The reflex is to re-read the deployment YAML for ten minutes, then `kubectl delete pod` and hope. The pod came back, crashed again, back-off stretched to 5 minutes, and the on-call lost an hour. Root cause CrashLoopBackOff is not an error,…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything

OpenAI 429s: your SDK is already retrying, so do not retry on top of it

Problem Under a burst load test our job throughput collapsed — not into a few failed requests, but into a thundering herd: p99 latency went from 900ms to 40s, and the org hit its per-minute token cap *harder* than when we were not retrying at all.…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything

Godot "Identifier not declared in the current scope": the node variable that exists in the scene tree but not in the script's timeline

Problem A GDScript that references a node in the scene stops parsing before the game even starts: The node exists — `Player > HUD > HealthBar` is right there in the scene tree — and the script uses `$HealthBar` a few lines later without complaint.…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything

Unity "The type or namespace could not be found" after adding an asmdef: the assembly boundary you drew without updating references

Problem Introducing assembly definitions to speed up compile times — a completely standard move once a project passes a few hundred scripts — immediately breaks the build: `GameCore` exists, it compiles on its own, and `using GameCore;` is right…

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React 19 hydration mismatch: the date that formats differently on server and client

Problem Next.js (App Router, React 19) started throwing on a page that renders an order list: The page still worked (React rebuilt it client-side), which made it easy to ignore — until we noticed the flash of unstyled content and a Lighthouse…

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Godot export fails with "No export template found at the expected location": the templates that do not upgrade with the Editor

Problem The game runs fine from the editor. Project > Export, pick Windows Desktop, hit **Export Project**, and it refuses: The Export dialog offers no download button, and the folder it names either does not exist or contains a `4.2.stable/`…

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GitHub Actions cache hit rate fell off a cliff: the lockfile path in your key changed

Problem A workflow that had been restoring dependencies in ~15 seconds started showing on every run. `npm ci` went from 15s to 2m40s, and CI minutes quietly doubled. Root cause The cache key hashes a lockfile at a path: Ours broke when a restructure…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything

Steam players hit "Failed to load steam_api64.dll": the depot that ships the game but not the DLLs the game loads first

Problem The game works on every dev machine, and the Steam review queue fills up within an hour of release: Running the same build from the shipped folder on a clean test VM reproduces it instantly — the defect was in the depot all along, invisible…

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Shader compile error: the varying you wrote out in the vertex shader and never read in — undeclared identifiers across the stage boundary

Problem A custom WebGL shader that renders black and floods the console: The vertex shader compiles cleanly on its own, the fragment shader compiles cleanly on its own, and the mistake is only visible when you read them **as a pair**. Root cause…

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pip hangs "Collecting" then resolves nothing: dependency backtracking and how to break it

Problem Adding one package to a Docker build:...followed by ten minutes of silence, a download storm, and eventually either success with a bizarre old version or: Root cause pip's resolver is a backtracking search. When your pins force it into a…

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Claude Code permission prompt loops: encode your trust once in settings.json

Problem Every session of Claude Code in our repo, the agent asked permission for the same dozen commands — `npm run build`, `git commit`, `wrangler deploy`. I clicked "always allow" so many times I stopped reading the prompts, which defeats their…

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MySQL error 1071 "Specified key was too long": utf8mb4, the 767-byte wall, and the one-line fix

Problem Migrating a schema from a legacy MySQL 5.6-era server to a modern one, one index refused to build: The column is `VARCHAR(255)`. It indexed fine on the old server. Same DDL, new server, failure. Root cause Index key length is measured in…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything

Unity WebGL "exception: Out of memory": the 2GB heap your browser build silently outgrew, and the abort you should be catching

Problem The WebGL build runs for minutes, then dies in the browser console — most often during a scene with heavy textures or after the player has been playing a while: Desktop builds of the same content never come close to a memory limit, which is…

🔒 diagnosis free — the fix is members-only · $1/mo unlocks everything

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