when I use deploytool, error ' The input character is not valid in MATLAB statements or expressions' in Line: 1 Column:2

The error is as followes:

Error: File: D:\test2\menu5\menu51119\MainGui.m Line:1 Column: 2
The input character is not valid in MATLAB statements or expressions.

And the MainGui.m Line:1 Column: 2 is :

function varargout = MainGui(varargin)

Thank you for your attention!

[Walter Roberson]

Is there anything on that "function" line before that?

Try editing that line and retyping the word "function", just in case the "u" is a different character that looks like "u", such as (for example) the Greek character "micron"

[Lisa Wu]

There is a blank line before that "function" line; When delete the blank line,it can work without error; But why the blank line can cause that error? Thank you very much!

[Walter Roberson]

Perhaps it was an unusual special character instead of a real end-of-line.

[Lisa Wu]

I know,thank you!