Request completed with warning after adding a column

Dear All,

I added a column in my report and when I ran it, it completed with warning. Previously it was working fine. Below is the error details of OPP log file:

Post-processing request 61578020.

[9/8/18 10:05:14 AM] [226384:RT61578020] Executing post-processing actions for request 61578020.

[9/8/18 10:05:14 AM] [226384:RT61578020] Starting XML Publisher post-processing action.

[9/8/18 10:05:14 AM] [226384:RT61578020]

Template code: XRCLSALESORDERLINESDET

Template app:  XRCL

Language:      en

Territory:     00

Output type:   EXCEL

[9/8/18 10:05:14 AM] [226384:RT61578020] Output file was found but is zero sized - Deleted

[9/8/18 10:05:14 AM] [UNEXPECTED] [226384:RT61578020] java.lang.reflect.InvocationTargetException

at sun.reflect.GeneratedMethodAccessor70.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:56)

at java.lang.reflect.Method.invoke(Method.java:620)