How to Fix Version Mismatch Errors in 5 Minutes

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Here’s a quick, practical guide to fix “Version Mismatch” issues when your code runs with the wrong interpreter (e.g., Python 2 vs 3) or an outdated runtime (e.g., old Node/Java/.NET).

Follow the steps from top to bottom once, then use the OS/language snippets as needed.

Goal: Make the runtime version that executes your code match what the project expects.