AttributeError: 'Or' object has no attribute 'as_independent'

[wilsonmonde at gmail.com]

Traceback (most recent call last):
  File "testcsv.py", line 17, in <module>
    print(sy.solve([x^2+x+1-t, x^3+x^2-t], x))
  File "C:\Python27\lib\site-packages\sympy\solvers\solvers.py", line 902, in so
lve
    solution = _solve_system(f, symbols, **flags)
  File "C:\Python27\lib\site-packages\sympy\solvers\solvers.py", line 1434, in _
solve_system
    i, d = _invert(g, *symbols)
  File "C:\Python27\lib\site-packages\sympy\solvers\solvers.py", line 2422, in _
invert
    indep, dep = lhs.as_independent(*symbols)
AttributeError: 'Or' object has no attribute 'as_independent'


Code:

import csv as csv
import os
import numpy as np
import sympy as sy
#from sympy import solve, Poly, Eq, Function, exp
from sympy import *
from numpy import *
from numpy.linalg import *
from sympy.polys.polyfuncs import interpolate
from sympy import Function, dsolve, Eq, Derivative, sin, cos
from sympy.abc import x

f = sy.Function('f')
x = sy.Symbol("x")
t = sy.Symbol("t")

print(sy.solve([x^2+x+1-t, x^3+x^2-t], x))
print(sy.solve((x^2+x+1-t, x^3+x^2-t), x))