How to display jMeter assertion results in the performance report in Jenkins? What constitutes an error in the performance report?
What constitute an error in the performance report is determined by the percentage of errors that the samples find
To see what the error is go tolast build->Peformance Report
you should see a listing of all of the samples in your jmeter test plan and the results
Then select the sample name and you should see a the results for the sample taken