SeriesData::scmn
An error occurs because the order of the leading term in the second series expansion is negative:
ComposeSeries[Series[x, {x, 0, 1}], Series[1 / t, {t, 0, 4}]]A similar error occurs if a series expansion with negative order is substituted into another series expansion:
Series[x, {x, 0, 1}] /. x -> Series[1 / t, {t, 0, 2}]