"The metadata object Table 2000000053 was not found" upgrading from 2016CU13 to 2017RTM

Hi,
I'm in the process to upgrade to Dynamics NAV 2017 from the latest Dynamics NAV 2016 CU (13).
While all CUs upgrades in the 2016 works fine, I can't understand what to do with this error:

PS C:\Users\Administrator\Desktop> Sync-NAVTenant -ServerInstance Company100

MicrosoftDynamicsNavServer$Company100
Confirm synchronization of default tenant in Sync mode
[Y] Yes  [N] No  [S] Suspend  [?] Help (default is "Y"): Y

Sync-NAVTenant : The metadata object Table 2000000053 was not found.
At line:1 char:1
+ Sync-NAVTenant -ServerInstance StudioQ100
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (0:Int32) [Sync-NAVTenant], NavCom
   mandException
    + FullyQualifiedErrorId : MicrosoftDynamicsNavServer$Company100,Microsoft.
   Dynamics.Nav.Management.Cmdlets.SyncNavTenant

Tried:
- recompiling all objects (before and after)

Many thanks in advance
francesco