Is this a fresh install or was it working before? My guess is there’s some issue with database connectivity.
You can also open the dev tools inspector and see what the response status code is on the request. Right click and choose “inspect element” to open the pane. In the networking tab (1 in the image) You’re looking for status codes 400 or higher (2), and the specific code error message (3). Sometimes there is additional information in the response (4).
