empty_csv — No header row, or no data rows

Forge needs a header row to name the columns — the header IS the vendor tag list that gets mapped to canonical fields. A file with no header, or a header and nothing else, cannot be normalized.

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Diagnosis

When you hit this

Exporting from a historian that writes data rows without a header.
A file whose first line is a title or metadata banner rather than column names.
A trailing export that produced only a header.

Resolution

How to fix it

Strip banner lines
Many historian exports put a title and export timestamp above the header. Delete them so the header is line one.
Keep the vendor's original column names
Do not rename columns to something friendlier before uploading. The original vendor spelling is what the corpus recognizes.

Normalization

What Forge does about it

The header row is doing the real work: each column name is looked up as a vendor tag. Without it there is nothing to resolve, so Forge rejects the file rather than positionally guessing — a positional guess would silently mislabel every column.