Data file too short Error

[Data file too short Error]

Check all files in your mission directory. If there is a filename with some characters not recognised by arma (i.e. None english letters) try changing this and try again.

Nope the file name is fine. the problem is when i edit it via notepad ++ then this error occurs.

---------- Post added at 12:39 ---------- Previous post was at 10:52 ----------

SOLVED it turns out i was editing my pbo files incorrectly. my mistake

[Data file too short Error]

I am trying to create my own Takistan Life Revolution mission file by editing a public mission file. as soon as i make an edit, save it and try to launch it via lan i get this error message

(would post link to picture but i am not allowed by the forums)

Data file too short '"Mission file name.pbo"' Expected 3068316 B, got 3067887

so i gathered that the 'B' is bytes which is the mission file size but why does it expect a certain size ?

I tried verifying my steam integrity but that did not do anything. am i doing some thing wrong with the editing perhaps.