Could you please check the version of com.day.cq.dam coming from uber jar (check uber jar for 6.5).
And also check in your pom.xml files anywhere you might have added dependency for com.day.cq.dam the version for com.day.cq.dam should be same as uber jar.
Uber jar for 6.5 should already have "com.day.cq.dam" embedded. I would recommend using uber-jar instead of adding manual dependencies. More details at [1]