The One Moment Please error message (Ref code: s0a00) will appear on your TV when the TV box has stopped receiving the current channel's signal. This can affect all channels at the same time, or individual channels. The error message can also appear when the cable box hasn't been activated correctly, and when it has been unplugged from power for an extended period of time.
To learn how to activate your TV box, read Shaw TV Box Activation.