try_convert is not a recognized built-in function name

Error :
'try_convert' is not a recognized built-in function name
              OR
How to change Compatibility Level
 

1. For checking Compatibility Level

USE DB_Name;
GO
SELECT compatibility_level
FROM sys.databases WHERE name = 'DB_Name';
 

2. Update Compatibility Level

ALTER DATABASE DB_Name  
SET COMPATIBILITY_LEVEL = { 140 | 130 | 120 | 110 | 100 | 90 }