if you use xampp or ... first close xampp or ...

go to this directori : xampp > php > php.ini ( find this file php.ini on php folder)

and open php.ini file with notepad

and search SQLite3

and remove ; this line ;extension=sqlite3

so finaly be extension=sqlite3

and save file 

end open xampp

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sorry i cant good speak english i hope i can help you.