Error ExplainerWhat this site gives you
Each page takes one error message that many people meet, and explains it in plain words: what the program is telling you, the usual causes in order of how often they happen, and the steps to fix it. What makes the pages different is that nothing is guessed. The code on every page was run on a real computer, and the message and the output shown are copied from the run, so you can compare them letter by letter with what you see on your own screen.
How to use it
- Copy the last line of the error (or the whole message) and paste it into the box above.
- Open the best match and compare the example with your situation.
- Follow the steps under "How to fix it". Try the first one before the others.
- If nothing matches, read the guide on searching for an error message.
Which errors are covered
We cover 57 errors now: 21 in Python, 14 in JavaScript (as Chrome words them), 10 in Excel and 12 in Git. These are the ones that beginners and office users meet most. Windows problems and phone problems have their own sections on this site, in PC Fix and Phone Fix.
Questions
Does the page send my error to a server?
No. The matching runs in your browser, and nothing you paste is stored or sent.
Why do some messages on the pages look different from mine?
Python, Chrome, Excel and Git change their wording between versions. The cause and the fix are the same, but a few words may differ. The pages say which version produced the text shown.
Can I rely on the fixes?
They are the usual remedies for the usual causes, and each was run. Your program may have another cause, so read the "Why it happens" part and compare.
This is an independent guide. It is not connected with Python, Microsoft, Google, GitHub or the Git project. Product names belong to their owners. Examples were run on 13 November 2026 in a practice folder or a blank workbook; your version may word a message slightly differently.