How to add dependency for flexiblesearchservice in a new extension?

Getting this error- Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'flexibleSearchService' of bean class [com.tisl.mpl.bin.daos.BinDao]: Bean property 'flexibleSearchService' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?