Error using . Unrecognized table variable name 'load_g_'.

This is the code, along with the error code:

%% Import the data before running this code
% This code is for bending analysis.
% Calculate the force from the load
BendingData.Force = 9.81.*BendingData.load_g_./1000;  %unit: Newton

Error using _._ Unrecognized table variable name 'load_g_'.

How do I fix it?

[Stephen23]

"How do I fix it?"

Make sure that BendingData contains a variable/column/field named load_g_.

[Walter Roberson]

When you did the readtable() did you use VariableNamingRule 'preserve' ?