Ok you got actually 2 errors.
Your visualisations are also pointing to the old index. did you try deleting all visualisations and dashboards from metricbeat and runnning the metricbeat setup --dashboards ? because the setting setup.dashboards.indexshould be enough to point to the correct index-pattern
Then check if the index is pointed correctly. You would have need to create a new index-pattern in kibana which is pointing to systembeat-* with systembeat-* as id. You can provide a custom id during the index-pattern creation.
The other error which you have seems to be a permission error. If you still have that error then try this discuss matter
Hope this helps