can you explain this error?

[choco]

I've got this erorr message and can't figure out how to fix..

---------------------
Computing x...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
File "lp_current.py", line 412, in find_current_target
comp_current_lp(g, dg, target, edge_weights, can_list)
File "lp_current.py", line 168, in comp_current_lp
sol=solvers.lp(c,A,b)
File "/opt/python-2.5.1/lib/python2.5/site-packages/cvxopt/
coneprog.py", line 2929, in lp
dualstart)
File "/opt/python-2.5.1/lib/python2.5/site-packages/cvxopt/
coneprog.py", line 682, in conelp
raise ValueError, "Rank(A) < p or Rank([G; A]) < n"
ValueError: Rank(A) < p or Rank([G; A]) < n

[Joachim Dahl]

It means that the constraints are linearly dependent, and therefore
the KKT matrix is singular.

You should check why

Rank(A) < p or Rank([G; A]) < n

where A has dimensions p x n.

Best regards
Joachim

[choco]

If the constraints are

x <=1
y <=1
x+y <=2

Is the KKT matrix considered singular? Then is there any way to find
what to remove from the
constraints (when the matrix is large and cannot be examined
manually)?