UNITY ERROR FIX HUB
Fast, actionable troubleshooting guides for common Unity runtime exceptions, compiler errors, physics bugs, and shader glitches.
NullReferenceException: Object Reference Not Set
Find the exact line number causing the crash, verify Inspector field serialization, and implement safe null conditional operators.
VIEW SOLUTIONMissingReferenceException: Object Destroyed
Prevent accessing destroyed enemy game objects, unhook dead event listeners in OnDisable, and sanitize coroutine loops.
VIEW SOLUTIONRigidbody Not Moving or Falling Through Floor
Resolve isKinematic flags, continuous collision detection for fast objects, and avoid Update vs FixedUpdate desyncs.
VIEW SOLUTIONCollider Not Detecting Collisions or Triggers
Audit the 3 golden collision rules: Rigidbody presence, isTrigger boolean matching, and the Physics Layer Collision Matrix.
VIEW SOLUTIONTrigger Not Working (OnTriggerEnter Not Firing)
Step-by-step checklist ensuring triggers fire reliably: verify isTrigger check, kinematic Rigidbody on moving triggers, and correct layer masks.
VIEW SOLUTIONUnity GameObject Not Moving With Script
Fix script disabled states, speed variable values set to 0 in Inspector, NavMeshAgent fighting Rigidbody, and Rigidbody constraints.
VIEW SOLUTIONTransform.Translate Stuttering & Jittering Fix
Switch from Transform.Translate to Rigidbody.MovePosition or Rigidbody.linearVelocity in FixedUpdate for buttery smooth 60 FPS physics.
VIEW SOLUTIONInvalidOperationException: Input System Error
Switch Player Settings Active Input Handling to 'Both' or migrate legacy Input.GetAxis to modern InputAction methods.
VIEW SOLUTIONInput Manager Deprecation Warning Fix
Upgrade older code bases to eliminate console compiler deprecation warnings and add multi-controller mapping.
VIEW SOLUTIONInput.GetKey / GetKeyDown Not Working Fix
Move keystroke detection from FixedUpdate to Update, check if full-screen UI canvases block mouse clicks, and test Input System settings.
VIEW SOLUTIONAudioSource Not Playing Sound Fix
Step-by-step checklist to restore sound: verify AudioListener on Camera, check 2D vs 3D spatial blend, and prevent audio cutoff.
VIEW SOLUTIONAudio Pitch Too Fast or Distorted Fix
Clamp AudioSource.pitch within safe acoustic limits (0.5 to 2.0) using Mathf.Clamp and normalized speed ratios.
VIEW SOLUTIONAudio Clip Not Looping or Pop at Seam Fix
Enable source-level looping, avoid PlayOneShot for looped music/engines, and remove DC offset zero-crossing clicks.
VIEW SOLUTIONUnity Prefab Changes Not Saving in Scene
Learn how to properly apply Prefab Overrides to the root asset or edit in Prefab Isolation Mode to prevent lost modifications.
VIEW SOLUTIONPink Material or Shader Not Showing Fix
Upgrade materials via Render Pipeline Converter or change shaders to Universal Render Pipeline/Lit in one click.
VIEW SOLUTIONUV Mapping Texture Stretched or Distorted Fix
Adjust texture wrap modes, tiling offset parameters, normal map tangent space recalculation, and non-uniform scale distortion.
VIEW SOLUTIONAnimator Animation Not Playing or Stuck Fix
Verify Animator state conditions, fix Has Exit Time transition blocking, and trigger animations safely with Animator.StringToHash.
VIEW SOLUTIONCS1061: 'Type' Does Not Contain Definition
Resolve casing mismatches, ensure variables have public or internal access modifiers, and check using directives.
VIEW SOLUTIONEngineController currentSpeed Definition Fix
Expose public getters/properties for currentSpeed in vehicle controllers so audio engines and UI HUDs can read live telemetry.
VIEW SOLUTIONAndroid Build Failed: SDK / NDK / JDK Fix
Align command-line Android toolchains, resolve API 34 SDK installation, clean corrupt Library caches, and enforce ARM64 IL2CPP builds.
VIEW SOLUTIONGradle Build Failed: AAPT2 & Manifest Merging Fix
Fix conflicting package dependencies, enable AndroidX multidex support, and customize mainTemplate.gradle safely.
VIEW SOLUTIONGame Lagging / Low FPS on Android Fix
Recover 60 FPS: lock targetFrameRate, downscale dynamic render scale, replace GC allocations with object pools, and optimize physics frequency.
VIEW SOLUTION