Cannot create a connection to data source 'Schoollogic.' Login failed for user. Most commonly, this comes up when trying to run reports but a new installation or a new user could run across it when simply trying to access SchoolLogic.
Here's a look at the actual error:
The user listed in the error -- RHOLZER\Reporter in the screen shot above -- does not have access to the SQL DB.
1. Launch SQL Management Studio, open Security, right-click Logins. Click New Login..
2. Fill in the Login name which came up on the error and enter/confirm a password.
4. On the left, click Server Roles. Then check everything you see here:
5. In the end, your list of users will include the username you've been editing: