'Degree 1 file not existing' 

When trying with GUI, encounter this error 'degree_1 file does not exist'. (Control file was modified as specified in the sample). What could be the reason?

<img width="835" alt="error4" src="https://github.com/fengweiigg/GRACE_Matlab_Toolbox/assets/118938302/4dc3821e-dea7-4648-a70b-5781339cb8ab">
