java.lang.IllegalStateException

SonarQube version: Version 7.1 (build 11001)
sonar-maven-plugin:3.5.0.1254

Getting following error while building project. I started getting below error after I removed one unused import statement.

org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.sonarsource.scanner.maven:sonar-maven-plugin:3.5.0.1254:sonar (default-cli) on project ds-api: Unable to blame file **/**/**/MyFile.java
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:213)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:154)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:146)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81)
        at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:309)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:194)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:107)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:993)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:345)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:191)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.MojoExecutionException: Unable to blame file **/**/**/MyFile.java
        at org.sonarsource.scanner.maven.bootstrap.ScannerBootstrapper.execute(ScannerBootstrapper.java:67)
        at org.sonarsource.scanner.maven.SonarQubeMojo.execute(SonarQubeMojo.java:104)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
        ... 20 more
Caused by: java.lang.IllegalStateException: Unable to blame file **/**/**/MyFile.java
        at org.sonarsource.scm.git.JGitBlameCommand.blame(JGitBlameCommand.java:128)
        at org.sonarsource.scm.git.JGitBlameCommand.access$000(JGitBlameCommand.java:44)
        at org.sonarsource.scm.git.JGitBlameCommand$1.call(JGitBlameCommand.java:112)
        at org.sonarsource.scm.git.JGitBlameCommand$1.call(JGitBlameCommand.java:109)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
        at org.eclipse.jgit.blame.BlameGenerator.getSourceStart(BlameGenerator.java:870)
        at org.eclipse.jgit.blame.BlameResult.loadFrom(BlameResult.java:338)
        at org.eclipse.jgit.blame.BlameResult.computeAll(BlameResult.java:240)
        at org.eclipse.jgit.blame.BlameGenerator.computeBlameResult(BlameGenerator.java:450)
        at org.eclipse.jgit.api.BlameCommand.call(BlameCommand.java:230)
        at org.sonarsource.scm.git.JGitBlameCommand.blame(JGitBlameCommand.java:126)