Traceback (most recent call last):

 "<stdin>", line 1, in <module>

 "sympy/solvers/ode.py", line 608, in dsolve
return _helper_simplify(eq, hint, hints, simplify)

 "sympy/solvers/ode.py", line 634, in _helper_simplify
return odesimp(sols, func, order, cons(sols), hint)

 "sympy/core/multidimensional.py", line 137, in wrapper
return f(*args, **kwargs)

 "sympy/solvers/ode.py", line 1797, in odesimp
eq = _handle_Integral(eq, func, order, hint)

 "sympy/solvers/ode.py", line 2571, in _handle_Integral
sol = expr.doit()

 "sympy/core/relational.py", line 99, in doit
lhs = lhs.doit(**hints)

 "sympy/integrals/integrals.py", line 579, in doit
conds=conds)

 "sympy/integrals/integrals.py", line 979, in _eval_integral
result = manualintegrate(g, x)

 "sympy/integrals/manualintegrate.py", line 1126, in manualintegrate
return _manualintegrate(integral_steps(f, var))

 "sympy/integrals/manualintegrate.py", line 930, in integral_steps
fallback_rule)(integral)

 "sympy/strategies/core.py", line 86, in do_one_rl
result = rl(expr)

 "sympy/strategies/core.py", line 86, in do_one_rl
result = rl(expr)

 "sympy/strategies/core.py", line 66, in null_safe_rl
result = rule(expr)

 "sympy/integrals/manualintegrate.py", line 686, in trig_substitution_rule
a = match[a]TypeError: 'NoneType' object has no attribute '__getitem__'

Traceback (most recent call last):


 "/home/manju/.local/lib/python3.5/site-packages/tornado/web.py", line 1543, in _execute

result = yield result


 "/usr/lib/python3.5/asyncio/futures.py", line 274, in result

raise self._exception


 "/usr/lib/python3.5/asyncio/tasks.py", line 241, in _step

result = coro.throw(exc)


 "/home/manju/jupyterhub/jupyterhub/handlers/login.py", line 81, in post

user = await self.login_user(data)


 "/home/manju/jupyterhub/jupyterhub/handlers/base.py", line 429, in login_user

authenticated = await self.authenticate(data)


 "/usr/lib/python3.5/asyncio/futures.py", line 361, in __iter__

yield self
# This tells Task to wait for completion.


 "/usr/lib/python3.5/asyncio/tasks.py", line 296, in _wakeup

future.result()


 "/usr/lib/python3.5/asyncio/futures.py", line 274, in result

raise self._exception


 "/usr/lib/python3.5/asyncio/tasks.py", line 239, in _step

result = coro.send(None)


 "/home/manju/jupyterhub/jupyterhub/auth.py", line 228, in get_authenticated_user

authenticated = await self.authenticate(handler, data)


 "/usr/lib/python3.5/asyncio/futures.py", line 363, in __iter__

return self.result()
# May raise too.


 "/usr/lib/python3.5/asyncio/futures.py", line 274, in result

raise self._exception


 "/usr/lib/python3.5/types.py", line 243, in wrapped

coro = func(*args, **kwargs)


 "/usr/local/lib/python3.5/dist-packages/ldapauthenticator/ldapauthenticator.py", line 109, in authenticate

if conn.bind():


 "/usr/local/lib/python3.5/dist-packages/ldap3/core/connection.py", line 521, in bind

self.open(read_server_info=False)


 "/usr/local/lib/python3.5/dist-packages/ldap3/strategy/sync.py", line 56, in open

BaseStrategy.open(self, reset_usage, read_server_info)


 "/usr/local/lib/python3.5/dist-packages/ldap3/strategy/base.py", line 149, in open

raise LDAPSocketOpenError('invalid server address')

ldap3.core.exceptions.LDAPSocketOpenError: invalid server address
