/opt/Sage/sage-7.0/src/sage/matrix/matrix2.pyx in sage.matrix.matrix2.Matrix.right_kernel_matrix (/opt/Sage/sage-7.0/src/build/cythonized/sage/matrix/matrix2.c:26391)()
   3628         if M is None:
   3629             try:
-> 3630                 format, M = self._right_kernel_matrix(algorithm=algorithm, proof=proof)
   3631             except AttributeError:
   3632                 pass

/opt/Sage/sage-7.0/src/sage/matrix/matrix_rational_dense.pyx in sage.matrix.matrix_rational_dense.Matrix_rational_dense._right_kernel_matrix (/opt/Sage/sage-7.0/src/build/cythonized/sage/matrix/matrix_rational_dense.c:14282)()
   1283         else:
   1284             A, _ = self._clear_denom()
-> 1285             K = A._rational_kernel_iml().transpose().change_ring(QQ)
   1286         verbose("done computing right kernel matrix over the rationals for %sx%s matrix" % (self.nrows(), self.ncols()),level=1, t=tm)
   1287         return 'computed-iml-rational', K

/opt/Sage/sage-7.0/src/sage/matrix/matrix_integer_dense.pyx in sage.matrix.matrix_integer_dense.Matrix_integer_dense._rational_kernel_iml (/opt/Sage/sage-7.0/src/build/cythonized/sage/matrix/matrix_integer_dense.c:31763)()
   3647         cdef mpz_t *mp_N
   3648         time = verbose('computing null space of %s x %s matrix using IML'%(self._nrows, self._ncols))
-> 3649         self._init_mpz()
   3650         sig_on()
   3651         dim = nullspaceMP(self._nrows, self._ncols, self._entries, &mp_N)

/opt/Sage/sage-7.0/src/sage/matrix/matrix_integer_dense.pyx in sage.matrix.matrix_integer_dense.Matrix_integer_dense._init_mpz (/opt/Sage/sage-7.0/src/build/cythonized/sage/matrix/matrix_integer_dense.c:6207)()
    223             return 0
    224         else:
--> 225             return self._init_mpz_impl()
    226 
    227     cdef inline int _init_linbox(self) except -1:

/opt/Sage/sage-7.0/src/sage/matrix/matrix_integer_dense.pyx in sage.matrix.matrix_integer_dense.Matrix_integer_dense._init_mpz_impl (/opt/Sage/sage-7.0/src/build/cythonized/sage/matrix/matrix_integer_dense.c:6421)()
    241         if not self._entries:
    242             sage_free(self._rows)
--> 243             raise MemoryError
    244         k = 0
    245         for i in range(self._nrows):

MemoryError: