访问localhost:8888出现该情况 如何解决

Traceback (most recent call last):  File "/usr/local/lib/python2.7/dist-packages/web/wsgiserver/__init__.py", line 1245, in communicate    req.respond()  File "/usr/local/lib/python2.7/dist-packages/web/wsgiserver/__init__.py", line 775, in respond    self.server.gateway(self).respond()  File "/usr/local/lib/python2.7/dist-packages/web/wsgiserver/__init__.py", line 2018, in respond    response = self.req.server.wsgi_app(self.env, self.start_response)  File "/usr/local/lib/python2.7/dist-packages/web/httpserver.py", line 306, in __call__    return self.app(environ, xstart_response)  File "/usr/local/lib/python2.7/dist-packages/web/httpserver.py", line 274, in __call__    return self.app(environ, start_response)  File "/usr/local/lib/python2.7/dist-packages/web/application.py", line 279, in wsgi    result = self.handle_with_processors()  File "/usr/local/lib/python2.7/dist-packages/web/application.py", line 249, in handle_with_processors    return process(self.processors)  File "/usr/local/lib/python2.7/dist-packages/web/application.py", line 246, in process    raise self.internalerror()  File "/www/server/panel/main.py", line 747, in internalerror  File "/www/server/panel/class/public.py", line 85, in getMsg  File "/usr/lib/python2.7/json/__init__.py", line 339, in loads    return _default_decoder.decode(s)  File "/usr/lib/python2.7/json/decoder.py", line 364, in decode    obj, end = self.raw_decode(s, idx=_w(s, 0).end())TypeError: expected string or buffer注：之前安装过lnmp

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