SQL SERVER : ERROR : Cannot open database requested by the login. The login failed. Login failed for user ‘NT AUTHORITY\NETWORK SERVICE’.

Cannot open database requested by the login. The login failed.
Login failed for user ‘NT AUTHORITY\NETWORK SERVICE’.

This is Common error which i found a solution

How to Fix??

1. Go to SQL Server >> Security >> Logins and right click on NT 

AUTHORITY\NETWORK SERVICE and select Properties

2. In newly opened screen of Login Properties, go to the “User 

Mapping” tab. Then, on the “User Mapping” tab, select the desired 

database – especially the database for which this error message is 

displayed. On the lower screen, check the role db_owner. Click OK.