The error you are seeing is related to the software of the phone.
Something has gone wrong or the Os or data are corrupted.
It is a halt error in booting or loading the Os of the phone due to this.
You should take it to your contract phone provider, where it will be sent to Samsung for repair.
Or, you can, turn off the phone.
Remove your memory or SD card.
And its sim if you can access it.
The next step if you have not installed a custom os, but have the stock version of Samsung`s Android os is to factory restore the phones os.
It will tell you on the net how to do this.
And the error should clear after the factory restore.