Spring org.springframework.beans.ConversionNotSupportedException excpetion

Could someone say why I am getting this exception ? And how to solve the problem ?

If I understand correctly com.test.dao.CustomerDAO$$EnhancerByCGLIB$$ae49026e_3 class generated at runtime by spring.

Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'com.test.dao.CustomerDAO$$EnhancerByCGLIB$$ae49026e_3' to required type 'com.test.dao.CustomerDAO'