Hi,
The error doesn’t look to have any relation with SonarLint.
I found many similar issues in JetBrains issue tracker, like this one: https://youtrack.jetbrains.com/issue/RIDER-61339
The advice from JetBrains is:
The issue might be caused by some custom plugins you use. So you need to remove all the custom color schemes and plugins that produce them to resolve this issue.