Moodle | New lang strings not accessible

In Moodle we had declared some new strings in lang file of a plugin like this:

$string[‘LIBRARY_NAME’] = 'E-Lab’;
$string[‘BOOK_READ_SUCCESS’]=’Congratulations on reading the book’;

We wanted to use it in view.php file of the plugin like this:

$result=Get_String(‘BOOK_READ_SUCCESS’, ‘plugin name’);

But the output was :

[[string]]

Solution : To access the string defined in lang file, we just need to update the version number in version.php file of the plugin.

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