If you see this error at the top of a GridBuddy Connect grid: “internal error: cannot read property “flatObjectName” of undefined"
It means that you put incorrect login information into the authentication popup.
The GridBuddy Connect admin should go to the GridBuddy Connect Wizard > Organization > Users and delete the user who is seeing this error. The user should then refresh the page where they were accessing the grid, and they will again see the authentication popup. They should login using the correct information, and the grid should load correctly.