I'm trying to include more columns on "Account" table to be synchronized with Zoho Reports, but it shows an error message and don't save my changes.

The message shown tells me that "an unexpected error occured during sync process. The error was registered and will be analysed" (something like this, but in portuguese) ->  Erro inesperado durante o processo de sincronização. O erro foi registrado e será analisado.

What could it be?