i have a bit problem here. i wanted to create a new page with pictures inside but it give me an error. i tried it using page content by entering the html 

code

<img src="http://xxx/xxx/xx" alt="xxx" height="xx" width="xx">

and come error 

An appropriate representation of the requested resource /v1/admin/pages/edit-local/id/477 could not be found on this server.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

what i do wrong here