Running PostLoadFcn of a Model

I have a m file added to the PostLoadFcn of the model. The m file is trying to load a .mat file in the working directory and I get the warning

Warning: Error evaluating 'PostLoadFcn' callback of block_diagram 'Model'. Reference to non-existent field 'load'.

[Kaustubha Govind]

Please paste the code in your PostLoadFcn callback MATLAB-file.