I used my own theme.
When I access admin page,the url is http://192.168.209.136/Marx/Security/login?BackURL=%2FMarx%2Fadmin%2Fpages
after click login button,the url is http://192.168.209.136/Marx/Security/Security/LoginForm.
and the content of page now is:
Action 'Security' isn't available on class Security.
I suppose that my theme has something wrong ,so I rename de default theme 'simple' to my own theme's name 'Marx'.
but the page doesn't change into 'simple' style,and the admin page still cannot access.
Therefore, all images in my article are missing too.I use "src='assets/images/pic1.jpg'".
in the homepage ,all images are ok.
but in the sub-page,the image's url will change into "page-0/assets/images/pic1.jpg'".
is there anyone who can tell me why?