Errors on Samsung Ace GT-S5830i

[Android Question]

Dear Sir,
I have a samsung ace GT S5380i mobile. i cannot open play store, there is an error. "The appliatiion Google Play Store ( process com.android.vending) has stopped unexpectedly. Please try again.Force Close".
And when I open Google search an error appears " The ap[plication Google search ( process com.google.android.googlequichsearchbox) has stopped unexpectedly. Please try again. Force close."
"The application Google Services Framework (process com.google.process.gapps). Please try again. Force close."

Please Advice.
Derek