that time the server shows this follow error
please check and clear this error,
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Not Acceptable
An appropriate representation of the requested resource /admin/settings/page could not be found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
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i ask to host about this
they told me
getting this issue because we have enabled mod security on server for security concern . And we can't disable it. So please consult with your programmer and update us for better assist.
