valueError: expected 2d, got 1d instead

[boring_accountant]

As per the error message, data.wgt is a pandas.Series object. You can get the data in a numpy array, which has the 'reshape' method, by accessing the 'values' attribute.

data.wgt.values.reshape(-1, 1)

A quick look at the Pandas docs point towards using 'to_numpy()' instead

data.wgt.to_numpy().reshape(-1, 1)