Parallel Computing fmincon in a for loop

Hi,

I have a for loop in which I run an fmincon optimization with parallel computing at each iteration. At the first iteration everything goes fine; however, in the second iteration I get the following warning.

File 'C:\Users\... \MathWorks\MATLAB\local_cluster_jobs\R2018b\Job2.lockstate' not found.

Note that I do use delete(gcp('nocreate')) in the beginning of each itration to delete the previous jobs.

Even though this is not an error and does not stop the code, I would appreciate it if someone could tell me if it is something that I should be worried about or not.

Thanks.