# ri > ActiveRecord::IrreversibleOrderError

## [ActiveRecord::IrreversibleOrderError](https://www.chedong.com/phpMan.php/perldoc/ActiveRecord%3A%3AIrreversibleOrderError/markdown) < [ActiveRecord::ActiveRecordError](https://www.chedong.com/phpMan.php/perldoc/ActiveRecord%3A%3AActiveRecordError/markdown)

(from /home/chedong/.local/share/rdoc)
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IrreversibleOrderError is raised when a relation's order is too complex
for reverse_order to automatically reverse.
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