用matlab的linprog函数求解时，出现了这样的问题，有谁知道怎么回事吗？
Exiting: One or more of the residuals, duality gap, or total relative error
has grown 100000 times greater than its minimum value so far:
         the dual appears to be infeasible (and the primal unbounded).      
         (The primal residual < TolFun=1.00e-008.)