# Fix text editor problems

Text editor problems are usually about the source rather than the editor, which is good news: the error message points at the line.

The exceptions are a language an administrator has disabled, and the usual browser-level causes.

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## What this is for

* A preview that shows an error instead of a diagram.
* A language missing from the list.
* An editor that will not load at all.

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## How it works

| **Action**             | **How**                                                                                    |
| ---------------------- | ------------------------------------------------------------------------------------------ |
| Preview shows an error | Read the line number. Compare against the worked example on the language's reference page. |
| Wrong language         | A parse error with no line often means the source is being read as another language.       |
| Language missing       | An administrator may have turned it off; TikZ is off by default.                           |
| Nothing renders at all | Hard reload, then a private window to rule out extensions.                                 |
| Very large source      | Generated sources can exceed the render limits. Filter before pasting.                     |

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## A few things that catch people out

* The error usually names the line, and it is usually right, except in TikZ where TeX errors point one line late.
* If the preview renders and the page does not, that is worth reporting.
* Broader symptoms are in [Troubleshooting](https://help.gocapable.com/diagrams/troubleshooting.html).

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## Related

[Code pane and live previewSource on one side, diagram on the other.](https://help.gocapable.com/diagrams/code-pane-and-live-preview.html)

[Change the diagram languagePicking it, and changing your mind.](https://help.gocapable.com/diagrams/change-the-diagram-language.html)

[Text editorBack to the editor overview.](https://help.gocapable.com/diagrams/text-editor.html)

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_The source is right there. Read it._