Error in computing river bedslope

[carlderas]

Hello! I am a geologist researcher, who uses the Topotoolbox to automatically delineate and compute river bedslope via knickpoints using data from IfSAR. I have been using the code for a long time, and this the first time I'd encountered such issue when I try computing for river bedslope using the Topotoolbox code.

To compute for river bedslope, first, we sort the attribute data using these codes:
shapefile='C:\Users\USER\Documents\MATLAB\TopoToolbox\knickpoints_filename.shp';
S = shaperead(shapefile);
attributeData = [S.distup];
[sortedData, sortedIndices] = sort(attributeData);
sortedShapefile = S(sortedIndices);
shapewrite(sortedShapefile,'C:\Users\USER\Documents\MATLAB\TopoToolbox\sorted_data_filename.shp');

Then, the difference in slope and elevation values are computed using these codes:
shapefile = 'C:\Users\USER\Documents\MATLAB\TopoToolbox\sorted_data_filename.shp';
S = shaperead(shapefile);
shapefileTable = struct2table(S);
attributeData_dist = shapefileTable.distup;
diff_dist = diff(attributeData_dist);
shapefileTable.diff_dist = [NaN; diff_dist];
attributeData_elev = shapefileTable.elev;
diff_elev = diff(attributeData_elev);
shapefileTable.diff_elev = [NaN; diff_elev];

River bedslope is computed via these next series of codes:
attributeData1 = shapefileTable.diff_elev;
attributeData2 = shapefileTable.diff_dist;
riverbedslope = attributeData1 ./ attributeData2;
shapefileTable.riverbedslope = riverbedslope;
updatedShapefile = table2struct (shapefileTable);
shapewrite(updatedShapefile,'C:\Users\USER\Documents\MATLAB\TopoToolbox\riverbedslope_filename.shp');

Now, when I'm on the part of constructing a table using updatedShapefile = table2struct at the part of computing for river bedslope, I encounter this error:
Not enough input arguments.

Error in table2struct (line 31)
s = cell2struct(table2cell(t),matlab.internal.tabular.makeValidVariableNames(t.Properties.VariableNames,'warn'),2);

Any ideas on how to resolve this error, or why this happens is very much appreciated. Thank you so much.

[wschwanghart]

Dear @carlderas
hm, that's a difficult one as you are using your own shapefiles. I have no ideas where the problem comes from. Did you check the function table2STREAMobj?
Cheers, Wolfgang