Version: 3.5.11 Reporter: matthewmcmullen —
This is an archived bug report. If you are experiencing a similar issue, upgrade to the latest release and if that does not solve the problem, submit a new bug report
Fatal error: Uncaught Error: Class ‘EllisLab\ExpressionEngine\Service\Validation\Rule\Callback’ not found in /home/public_html/dev/system/ee/EllisLab/ExpressionEngine/Service/Validation/Validator.php:118 Stack trace: #0 /home/public_html/dev/system/ee/EllisLab/ExpressionEngine/Service/Model/Model.php(527): EllisLab\ExpressionEngine\Service\Validation\Validator->defineRule(‘unique’, Array) #1 /home/public_html/dev/system/ee/EllisLab/ExpressionEngine/Service/Model/Model.php(474): EllisLab\ExpressionEngine\Service\Model\Model->ensureValidationAliases() #2 /home/public_html/dev/system/ee/EllisLab/ExpressionEngine/Controller/Design/Template.php(617): EllisLab\ExpressionEngine\Service\Model\Model->validate() #3 /home/public_html/dev/system/ee/EllisLab/ExpressionEngine/Controller/Design/Template.php(236): EllisLab\ExpressionEngine\Controller\Design\Template->validateTemplate(Object(EllisLab\ExpressionEngine\Model\Template\Template)) #4 [internal function]: EllisLab\ExpressionEngine\Co in /home/public_html/dev/system/ee/EllisLab/ExpressionEngine/Service/Validation/Validator.php on line 118
ExpressionEngine implements Markdown Extra and BBCode. Please see the Markdown Extra docs and the BBCode Wikipedia article for a full reference.
**bold**, __bold__, *italics*, _italics_, ~strike/del~, `code()`
bold, italics, strike/del, code()
Link: [link title](https://example.com)
Image: 
[blockquote]...[/blockquote], [quote]...[/quote], and Markdown style:
> Some quoted text. > > This is all one quote.
[code]...[/code], and you can also specify the language for syntax highlighting, [code=php]...[/code]
GitHub flavored Markdown code fences are also supported:
```
public function decoderRing($str)
{
return str_rot13($str);
}
```