Hi Karthik,
SonarQube 6.7.5 is far beyond end of life. We’d recommend you upgrade to at least the 7.9.4 release. And then you’ll find that support for the .exec format of JaCoCo is since completely removed. You’ll need to generate a JaCoCo XML report to get code coverage going forward. We wrote a guide to help with this.
Re: the Lizard error, that appears to be coming from a plugin you added to your instance and doesn’t appear related to the problem you describe.