I created a Custom Report, that is shown as an Evolution Graph. When I turn the displayed metrics on or off, I get the following error message:
Oops… there was a problem during the request. Maybe the server had a temporary issue, or maybe you requested a report with too much data. Please try again. If this error occurs repeatedly please [contact your Matomo administrator] for assistance.
When I reload the page the change of metrics is displayed. The same error message appears when I try to change the period.
What could be the origin of this problem?