Error using save

Hi,
I tried to save the configuration mat file for running DPARSF, but I got the following error. I simply cannot save it. Any idea? (Note: the path, up to /working/ is correct/present). By the way, I am now using V3.1_141101.

Error using save
Unable to write file
/data2/dparsf_run_maki/working/sub55_compcor_config.mat: No such file or
directory.

Thanks,
Maki