The error message "xcodebuild: error: The workspace named 'app' does not have a scheme called 'app'" is requesting to solve what issue?

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This error message is indicating that there is no scheme with the name "app" in the workspace named "app". The issue needs to be resolved by either creating a scheme with the name "app" in the workspace or by correcting the name of an existing scheme in the workspace so that it matches what is specified in the build command.