Training data fast RCNN Error

I´m trying to train a fast RCNN, but when i put this code:

>> load ('Tdata.mat');

>> Labeldata=Tdata;

>> Labeldata.imageFilename=fullfile('C:\Users\JV\Desktop\Labeldata.imageFilename');

i get this error: To assign to or create a variable in a table, the number of rows must match the height of the table.

The number of images that i have in that file is 6,808 and the height of my table "Tdata" is the same..

Please, any help, i don´t know what to do!!