Both of these are warnings and are described in the documentation. See DocCommentXchange
Since this is a warning and there is nothing to suggest that the sync has failed, you can ignore the [10039] warning. If the sync has failed, please post the error reported (it will be lines starting with E. ).
The [10040] error likely can be ignored based on questions that you asked previously. Please review the error details from the documentation link described earlier to ensure that the warning can be ignored based on your implementation.