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Unknown Property - yii \ base \ UnknownPropertyException Getting unknown property: common \ models \ Articles :: id

if (method_exists($this, 'set' . $name)) { throw new InvalidCallException('Getting write-only property: ' . get_class($this) . '::' . $name); } else { **throw new UnknownPropertyException('Getting unknown property: ' . get_class($this) . '::' . $name);** }