I keep getting error using plot not enough input arguments

filename = 'instr_04_01.csv'
data = readtable('instr_04_01.csv', 'ReadVariableNames', true)
theLoad = str2double(data.Extension(2:end));
displacement = str2double(data.Load(2:end));
plot(theLoad, displacement, 'b-', 'LineWidth', 2)
grid on;
title(filename, 'FontSize', 15, 'Interpreter', 'none');
xlabel('Load', 'FontSize', 15);
ylabel('Displacement', 'FontSize', 15);