Errors of the type '‘ak.wwise.locked’ are caused by a modal window or a task in Wwise that cannot allow for WAAPI calls to be processed concurrently. This is the case, for example, when a project is being loaded, a User/Project Preference window is open or SoundBank generation is in process.
Game engine integrations send a 'ak.wwise.core.getInfo' WAAPI call to Wwise at a regular interval for synchronization purposes: if those call occur while the Authoring application is in one of the aforementioned states, this error would be logged.
This is something we are working to address in a future release, but for now these WAAPI log errors can be safely ignored in your workflow. You can also filter out log messages from the Log view settings.