Hi Daniel Hinojo,
Report definitions are an Opendistro feature that is not under Wazuh app control.
From the Wazuh app, you could generate reports from any Module available in Wazuh -> Modules -> Generate report.
About your issue, I’ve found that this is a known Opendistro issue that will be fixed in Opendistro 1.13.0.
For more info about the issue you could check: https://discuss.opendistrocommunity.dev/t/kibana-reporting-getting-error-while-downloading-reports/4414/2, and the issue associated https://github.com/opendistro-for-elasticsearch/kibana-reports/issues/256. The fix is already in a dev branch, introduced in this PR https://github.com/opendistro-for-elasticsearch/kibana-reports/pull/313 and will be available in Opendistro 1.13.0.
Hope it helps!
Regards, Víctor.