I refer http://jmeter.apache.org/usermanual/generating-dashboard.html#configure_general, the resulting report errors number is not correct , the value is always more than the actual situation 1 (cvs , only five false, but the display 6 errors number), I do not know bug or I did not find the configuration of the place is not Jmeter3.0 ?
It is a reported minor issue in JMeter :
Error count in report dashboard is one off.
It is now fixed in jmeter nightly build: