java - Blackberry - "[projectname].debug file is missing" and "I/O Error: Cannot find program "jar" -

I'm working on the 1.4.5 BlackBerry project, running with the Blackberry Java plug-in. Generally by building and debugging in project emulator, I started not starting it:

A prompt saying " [projectname] .debug file is missing ".

A message in the Blackberry Packaging Console is saying " I / O error: Program can not be found" Jar ": CreateProcess Error = 2. "

this?

It has been found that there may be some different reasons, in some instances, Due to killing it can happen.

In my case, the environment variable for the path in Windows> System Properties had disappeared. The noteable thing is that when you put it back (in my case "c: \ program files \ java \ jdk1.6.0_18 \ bin"), then it should be the first entry in the path variable.