Posting this miscellaneous case of " input arguments of type 'struct' " error in case others find this useful:
In my case, I was runnnig my own local matlab scripts and the "lqrpilot" example code in matlab. The constant swapping between two paths, loading and clearing of workspace variables and matlab paths while working with these two code bases located in two different places seemed to have messed up the function path requirements of matlab. Due to this, I started getting " input arguments of type 'struct' " errors on my project/code base as well though it was not of primary use.
Closing and restarting MATLAB helped it reset all variables to default values and both code bases started to work again.
