i've some exit code 128. what does it mean??

This is program specific. For explanation check documentation of the program returing this exit code.

: i've some exit code 128. what does it mean??

yes but if i restart the 24x7 service the job works properly without exit code 128.

: This is program specific. For explanation check documentation of the program
: returing this exit code.

Still, exit code 128 is returned by the started process. You need to find out the meaning of this code before you decide if that code indicates a problem and if yes, how to fix it.

: yes but if i restart the 24x7 service the job works properly without exit
: code 128.