error occurred when run site

this error occurred when run site

Login failed for user 'NT AUTHORITY\NETWORK SERVICE

From stackoverflow

• Sorry I solved It The Connection string information wasn't right

• You may need to create the user and give them permission to your database.

  You can do this under Security in SQL Server Management Studio or create a SQL query and paste the following in:

  USE [DBNAME];
  CREATE USER [NT AUTHORITY\NETWORK SERVICE] FOR LOGIN [NT AUTHORITY\NETWORK SERVICE]
  GO
  

  You may also need to add them to a role like this:

  USE [DBNAME];
  EXEC sp_addrolemember N'db_owner', N'NT AUTHORITY\NETWORK SERVICE'
  GO