{
    "cli": "lms.cli.courses.gradebook.upload",
    "arguments": [
        "--course", "Extra Course",
        "__DATA_DIR__(gradebooks/extracourse_shortheader.txt)",
    ],
    error: true
}
---
builtins.ValueError: File '__DATA_DIR__(gradebooks/extracourse_shortheader.txt)' line 1 (assignments line) has the incorrect number of values. Need at least 2 values (user and single assignment), found 1.
