Traceback (most recent call last):


 "/Users/igortkachenko/Tools/kivy-designer/venv/lib/python3.6/site-packages/kivy/uix/widget.py", line 265, in _widget_destructor


 "/Users/igortkachenko/Tools/kivy-designer/venv/lib/python3.6/site-packages/kivy/lang/builder.py", line 760, in unbind_widget


 "kivy/weakproxy.pyx", line 30, in kivy.weakproxy.WeakProxy.__getattr__
AttributeError: 'weakref' object has no attribute 'cline_in_traceback'

Traceback (most recent call last):


 "C:\Users\az\opensource\Jarvis\jarviscli\CmdInterpreter.py", line 223, in try_do

do(self, s)


 "C:\Users\az\opensource\Jarvis\jarviscli\plugin.py", line 209, in run

self._backend[0](jarvis.get_api(), s)


 "C:\Users\az\opensource\Jarvis\jarviscli\plugins\evaluator.py", line 166, in limit

term = solve_y(term)


 "C:\Users\az\opensource\Jarvis\jarviscli\plugins\evaluator.py", line 237, in solve_y

return solve_y("({}) -y".format(s))


 "C:\Users\az\opensource\Jarvis\jarviscli\plugins\evaluator.py", line 229, in solve_y

results = sympy.solve(s, y)


 "C:\Users\az\opensource\Jarvis\env\lib\site-packages\sympy\solvers\solvers.py", line 1174, in solve

solution = _solve(f[0], *symbols, **flags)


 "C:\Users\az\opensource\Jarvis\env\lib\site-packages\sympy\solvers\solvers.py", line 1511, in _solve

f_num, sol = solve_linear(f, symbols=symbols)


 "C:\Users\az\opensource\Jarvis\env\lib\site-packages\sympy\solvers\solvers.py", line 2086, in solve_linear

n, d = eq.as_numer_denom()


 "C:\Users\az\opensource\Jarvis\env\lib\site-packages\sympy\core\add.py", line 466, in as_numer_denom

content, expr = self.primitive()


 "C:\Users\az\opensource\Jarvis\env\lib\site-packages\sympy\core\add.py", line 948, in primitive

c, m = a.as_coeff_Mul()
AttributeError: 'Tuple' object has no attribute 'as_coeff_Mul'
