Error using Fullfile

[KimHu123]

Hi there!

I'm using the swa_SW_Template since I would like to look into the SW characteristics.
I have already preprocessed the data and created an .set file.
Whenever I run the swa_SW_Template it throws the error:

Error using fullfile
Char inputs with multiple rows are not supported.
Caused by:
error using horzcat
Dimensions of matrices being concatenated are not consistent.

I'm not sure how to solve this and I was wondering if you could help me :)