Exception while creating dynamic attribute

I was created one dynamic attribute for the customer and created handle class for that,but i get an exception "Caused by: de.hybris.platform.servicelayer.exceptions.SystemException: cannot find spring bean [Customer_longNameAttributeHandler] configured for dynamic attribute [Customer.longName] from extension [lycamobilecore] " like this.I remove the created dynamic attribute and all related class and bean configurations and trying to start server.but still getting same exception.can anyone tell why that exception coming