Exiting: One or more of the residuals, duality gap, or total relative error
has stalled:
         the primal appears to be infeasible (and the dual unbounded).
         (The dual residual < TolFun=1.00e-008.)
求解线性规划，出现上面提示信息，同时也给出了解，请问是什么意思，这个解可用吗，请大神指教