Default "Unfortunately the process has stopped"

All of sudden I started receiving msg at my galaxy note 2 n7100 ...
"Unfortunately the process has stopped"
maybe I have installed something ...

but solution is simple ... go inside settings ... then accounts ... then samsung account ... and uncheck sync internet ... I dont know what it is and why it is there but that's the trick.
if someone can explain ... or find it helpful then it is great.

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