View the original community article here
Last tested: Dec 20, 2019
From the Manage LookML Projects page, if there is more than one model with the same name you will get this error message "Model already configured"
If there is only one model in the project under this name:
Someone made a first model >
configured it >
made a second model with same name >
deleted first model from project >
can't configure second project as model already exists
Delete configuration of the first model in manage lookML Projects, then configure the second model.