Error when adding DesignToken field to existing MatrixBlock

[peerfischer]

Hello,

when I add the DesignToken field to an already existing Matrix Block , I get an error when I try to open this page in Backend.

`Unknown Property – yii\base\UnknownPropertyException
Setting unknown property: trendyminds\designtokens\models\TokenModel::0

1. in /usr/www/users/oechslfx/stage/vendor/yiisoft/yii2/base/Component.phpat line 209
   200201202203204205206207208209210211212213214215216217218 $behavior->$name = $value;
   return;
   }
   }

    if (method_exists($this, 'get' . $name)) {
        throw new InvalidCallException('Setting read-only property: ' . get_class($this) . '::' . $name);
    }
   
    throw new UnknownPropertyException('Setting unknown property: ' . get_class($this) . '::' . $name);
   

   }

   `

Any ideas on this?

Best
p