Plugin could not be activated because it generated 2 chars of unexpected output

Hi guys,

I can not activate my plugin it shows error msg like this

“Plugin could not be activated because it generated 2 characters of unexpected output”

Here is is my test snippet:
<?php
// Plugin Name: test test test
?>
<?php

function create_table()
{
global $wpdb;
$table_name = $wpdb->prefix . “test_test_test”;
if($wpdb->get_var(“show tables likes ‘$table_name'”) != $table_name){
$myquery = “CREATE TABLE “.$table_name.” (
ID int(10) NOT NULL AUTO_INCREMENT,
name VARCHAR(20) NOT NULL
);”;
require_once(ABSPATH . ‘/wp-admin/includes/upgrade.php’);
dbDelta($myquery);
}
}
register_activation_hook( _FILE_,’create_table’);

?>

I dont why, i’ve google for an hour and still didnt find solution,

Anyone please ?

Thank you