when i save .m files i get warning? why?

i am getting this warning

"The system cannot find the path specified "

i couldnot save my file further with this warning .But my program is in proper path. What will be reason

Answer 1

[Image Analyst]

It's not the proper path, at least not anymore. Perhaps it was but you pulled out the flash drive, or something like that. Do a "Save as..." and save it. After that it should be fine.