failed to open summary logs errors message ?

[Guest]

hitrying to summary statistics under device manager (2.1.1a)result following error message failed to open summary logs (you must check  summary log )how can i fix this problem ?thanksJYP

[Guest]

1) Click on "Summary" Tab on Device Manager2) Click in log box at far right on what interfaces you wish to look at stats on3)Now click on summary statistics