Check this link if it helps you: The light of the LAMP...: CRON error: grandchild failed with exit status 1 [Solution]

Also have you checked:
-----> Permissions on files, directories;
-----> If the script is correctly written, paths?
-----> Isn't it an error in your job? Have you checked the log file of your job?
-----> What does the script do? and has it ever worked with cron?

You can create a simple script and put it to run through cron:

Code:

# cat ./testCron.sh
#!/bin/sh
echo "[$$] Sleeping 10 secs..."
sleep 10 
echo "[$$] Done."

And put it to run in cron this way:

Code:

<PathToScript>/testCron.sh > <PathToScript>/testCron.log