HELP-Sometimes I go to GYM, but always shows "error" on the top.

[AC Question]

Sometimes I go to GYM, but always shows "error" on the top. Why?
Please help. Many thanks.
(SORRY, my english is not good)

 

[the tall guy]

when you go to the gym it says error? is there a personal trainer or receptionist you can speak to about this issue?