Internal Server Error

The server has either erred or is incapable of performing the requested operation.

Traceback (most recent call last):
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1535, in __call__
    rv = self.handle_exception(request, response, e)
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1529, in __call__
    rv = self.router.dispatch(request, response)
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1278, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1102, in __call__
    return handler.dispatch()
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 572, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 570, in dispatch
    return method(*args, **kwargs)
  File "/base/data/home/apps/s~imspime/xprs159bf2-j7.454640753755912087/backend/imxprs.py", line 571, in get
    self.response.out.write(serveView({"request_scheme":self.request.scheme, "static_server":getServerPath(self)}, siteToServe, path, "", 'live'))
  File "/base/data/home/apps/s~imspime/xprs159bf2-j7.454640753755912087/backend/imxprs.py", line 1142, in serveView
    requestedPageSlugEntry = getVbidBySlugAndCreator(siteToServe.creator,siteToServe.vbid,pageSlug[1:])
  File "/base/data/home/apps/s~imspime/xprs159bf2-j7.454640753755912087/backend/xprsDB.py", line 146, in getVbidBySlugAndCreator
    "ORDER BY created DESC", slug,creator,rootId).get()
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/1/google/appengine/ext/ndb/query.py", line 1513, in gql
    qry = qry._bind(args, kwds)
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/1/google/appengine/ext/ndb/query.py", line 1485, in _bind
    filters = filters.resolve(bindings, used)
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/1/google/appengine/ext/ndb/query.py", line 647, in resolve
    nodes = [node.resolve(bindings, used) for node in self.__nodes]
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/1/google/appengine/ext/ndb/query.py", line 483, in resolve
    return self.__prop._comparison(self.__op, value)
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/1/google/appengine/ext/ndb/model.py", line 987, in _comparison
    value = self._do_validate(value)
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/1/google/appengine/ext/ndb/model.py", line 1092, in _do_validate
    value = self._call_shallow_validation(value)
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/1/google/appengine/ext/ndb/model.py", line 1284, in _call_shallow_validation
    return call(value)
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/1/google/appengine/ext/ndb/model.py", line 1331, in call
    newvalue = method(self, value)
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/1/google/appengine/ext/ndb/model.py", line 1776, in _validate
    (value,))
BadValueError: Expected valid UTF-8, got 'ag/\xe5\x93\x88\xe5'