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As this is a solar powered watch,there is the PS (Power Saver) function.
If PS is ON (which is by default) display will become blank if watch stays in the dark for sometime.As you bring it back in light,display will be activated automatically.You can switch PS to OFF and have display activated all the time even in dark (not recommended) but in this case battery will run short quickly.And this watch needs power as it is a multifunction watch + atomic time setting.
Most probably the unit has been opened or else the contacts on the back plate have been misaligned. What you need to do is to carefully open the back plate and check the two contact pins to be properly touching the plate. RE install carefully and the error should go. .
it's because the contact that sense whether the watch is opened or not is misaligned. Just open the watch caseback, re-allign the gold contact on the case-back, and make sure it touches the spring in the other side of the watch.
Casio solar watch has no battery it is powered by solar,but there is a storage capacitor like a battery.It will last for 5years that capacitor.Try to hold all the buttons and press hold simultaneuosly for 7 seconds this for reset the watch..
If you look very closely you will see that one side of the clip goes nearly under the battery. the plastic there has what looks like a small hole near the metal. It is in fact a slot. use a straight pin inserting it in the slot and gently moving the clip away from the battery. There is bend tension on the clip and it should raise slightly when released. Then use a tweezer grab the battery.
use your tweezer to hook the clip back over th plastic after you insert 4 new batteries.