Check by ssh returning code Unkown

Hi All, 
I have to check some remote functions actually localised application logs..
I am using check_by_ssh as a wrapper for executing remote plugins... 
The results I am getting are perfectly Okie.. But the problem is return code
... I can explain it like this 

[netsaint@angela libexec]$ ./check_by_ssh -H 192.168.3.61 -l ashish -t 60 -C
'/home/ashish/test.sh' -f
Hi this is the Plugin By Ashish.......
[netsaint@angela libexec]$ echo $?
255

echo $? returns 255 actually it shoud return 1

The code of test.sh is here 

#!/bin/sh
echo "Hi this is the Plugin By Ashish......."
echo `date` >test.txt
exit 0;

Even I used the netsaint plugin for check_ssh though the output was correct
but the return code was UNKNOWN...

Can anyone tell me where am I wrong ....

Thanks in Advance 

Regards
Ashish Lahori