ssis execute process task error: process exit code was 1 while the expected was 0

Hi Sir,

in my SSIS Package(2012) i am using Execute Process Task which will call bat file.  bat file is located on UNC Path.i am having  the below script in the batch file.

 del \\servername\foldername\name.txt

 rcmd \\servername D:\name1.bat

 del \\servername\foldername\name2.txt

xcopy \\servername\foldername\file.txt   \\server\foldername\outfilefolder

i am getting the below error message:

ssis execute process task error:  process exit code was 1 while the expected was 0

i want know at what cases error exit code was 1?

Thanks for your time.