function digest(unknown, unknown) does not exist

Hi All,
While executing this below function I'm facing this error.
Let me know if someone had the same issue in postgresql 10.x

ERROR: function digest(unknown, unknown) does not exist
LINE 1: select encode(digest('123', 'sha256'),'hex');
^
HINT: No function matches the given name and argument types. You might
need to add explicit type casts.
SQL state: 42883
Character: 15

Thanks & Best Wishes,

Ashok

---------------------------------------------------------------------------------------------------------------------

Ashokkumar Mani *(OCP12c/11g/10g/9i, AWS SAA, M103)*

*Dubai** , UAE* *| BLR , INDIA*

M: *+971 54 723 0075 *| *+91 90086 70302 | *WApp :* +91 81975 99922*

W: https://dbatocloudsolution.blogspot.in/
<http://dbatocloudsolution.blogspot.in/> | E: dbatocloud17(at)gmail(dot)com