Trying to access the first element by name via get method always fails:

Mapping for a not found, expected one of [a, b, c, d]

--Example--

CSVFormat fmt = CSVFormat.EXCEL.withHeader().withDelimiter(';' as char)
def data = readCSV file: 'test.csv' , format: fmt
echo records[0].get('d')
echo records[0].get('c')
echo records[0].get('b')
echo records[0].get('a')

--Output--

3

2

1

Mapping for a not found, expected one of [a, b, c, d]

--'test.csv' contents---

a;b;c;d
test;1;2;3