Error Wrong content-type "text/html" expected "application/json when I want to create a dashboard?

[Jérôme]

Hello, when I want to create a dashboard on the free license of Splunk v9.0.4.1, I get the error ' Wrong content-type "text/html" expected "application/json" '.

I've searched everywhere where the error may come from, I can't find... For information, I just installed Splunk and inserted some logs

[ITWhisperer]

What steps did you follow to create the dashboard?

[Jérôme]

On the main page, I clicked on "Search & Reporting". Then, among the tabs present at the top, "dashboards", "Create a new dashboard". After that, I put "test" as the title and then chose "Classic Dashboards". Finally, when I click on "Create", the error appears.