Sonarqube & Dotcover - Coverage Metric is N/A or '-'

I am running dotcover to generate a coverage report and then running that through sonarqube 5.0.1 (via Jenkins plugin). I used to have coverage metrics from previous runs, however, not sure what changed in build job / source code that now code coverage shows "-", even though all tests are successful (except 1 skipped). Not sure why this happens. Looking at the dotcover report generated - I can see the coverage, just not in sonar.

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Can anyone provide simple troubleshoot steps for this scenario? Jenkins build log does not show any relevant error or exception.

Any insight on this will be much appreciated.

Thanks,