Error with FMe method

[chepo92]

Dataset: bidmc (1 subject), matlab R2019a, with FMe method enabled (in up.al.sub_components.ekg_feat) and any of , 'qrS' , 'rsS', 'Rang' in up.al.options.FMe I'm getting the following error:

Unable to perform assignment because the left and right sides have a different number of elements.

Error in FMe>identify_max_upslopes (line 504)
        max_upslopes.v(s) = sum((rel_data.x - x_bar).*(rel_data.y - y_bar))/sum((rel_data.x - x_bar).^2)

Error in FMe>calc_qrS (line 303)
max_upslopes = identify_max_upslopes(peaks, qrs_onsets, sig_data, up);

Error in FMe (line 149)
                feat_data = feval(['calc_' up.al.options.FMe{current_opt_no}], peaks, onsets, sig_data.fs, sig_data, up);

Error in extract_resp_sig (line 27)
            feval(rel_sub_comps{sub_comp_no}, up.al.options.extract_resp_sig{option_no}, up);

Error in RRest (line 63)
        feval(up.al.key_components{key_comp_no}, up);

Error in runRRest (line 17)
RRest('bidmc_short')

I made it print sum((rel_data.x - x_bar).*(rel_data.y - y_bar))/sum((rel_data.x - x_bar).^2) which results in:

   1.0e-16 *

   -0.5551         0    0.5551

Maybe it should be * instead of .* operation sum((rel_data.x - x_bar)*(rel_data.y - y_bar))/sum((rel_data.x - x_bar).^2) ? as that way it will output an scalar