Custom Execution step in Workflow is failing

Hi All,

One of Custom Execution step in EBS full download is failing, getting below error..

Custom Execution step is nothing but we are loading Item file (.csv format)  to custom staging tables and Demantra staging tables through Shell Script. But when we execute the shell script from putty it get loaded, whereas in Workflow it fails.

I also checked execution.shell in Workflow Parameters it is null and path given in Execution step is also correct.

Error Message:

Schema ID:   1613

Schema name: 'PLL EBS Full Download'

Step ID:     'Step1'

Step name:   'Load Items from Flat File'

Error description 'Process terminated with errors ,please check the process logs for more