How to fix "*WARNING* file /home/Kaveri/CDS.log Malformed Lock-Stake file.", when running virtuoso?

Hi All,
When I start virtuoso, I have this message:
*WARNING* file /home/Kaveri/CDS.log Malformed Lock-Stake file. Close this program, remove Lock-Stake file manually or using clsAdminTool and restart application.
*WARNING* file /home/Kaveri/CDS.log.2 Malformed Lock-Stake file. Close this program, remove Lock-Stake file manually or using clsAdminTool and restart application.
*WARNING* file /home/Kaveri/CDS.log.3 Malformed Lock-Stake file. Close this program, remove Lock-Stake file manually or using clsAdminTool and restart application.

After waiting a few minutes, virtuoso opens up.
But, how to fix the Warnings?

Best regards,
Marben