error "duplicate template IDs" importing hosts from a previus Zabbix version

[rbologna]

Hi, I exported templates and host from a current running version of Zabbix (4.2). And I also installed a new version in another server. I imported templates successfully but then importing hosts it fails with this error:

• Cannot pass duplicate template IDs for the linkage: template ID "10233" is passed 2 times.

How can I know which template is duplicated?. In XML file there is not an ID.
How can I debug it?.
Thanks in advance.rené