At least one component of Little Snitch has not been updated correctly and most likely this is related to an issue with the kernel cache. As Little Snitch consists of multiple parts (including a kernel extension) it is necessary to update the kernel cache after the installation. Updating the kernel cache might reveal issues with third-party extensions. Please try to restart the system, run the Little Snitch Installer again. If the issue persists please generate a diagnostics report and contact our tech support team.