Final answer:
Overregularization errors occur because of the reliance on the rule-based system rather than the exception-based system in the dual route model.
Step-by-step explanation:
The dual route model's view on errors suggests that overregularization errors occur because of the reliance on the rule-based system rather than the exception-based system. According to this model, language learning involves two separate systems: the rule-based system, which applies grammatical rules, and the exception-based system, which stores irregular word forms. Overregularization errors occur when a child applies grammatical rules to irregular verbs or nouns by mistake.