problem with m-file that was creating from comsol 3.4

I am using comsol 3.4, and I save as file to an m-file. When I am trying to open it from a comsol script I get this error

Error: Attempt to reference non-existent field. Field: mesh droso 71 fem.mesh=meshinit(fem, ...

Do anyone khow what is happening?

or how can I read files like mphtxt via m-file.

Thank you guys.