Getting exception when running reportRun.run() in batch job

I have a batch job which save report as a pdf and send mail using saved pdf. The issue is when i run it using job it works fine but when i use it with batch job it gives the following exception:

Microsoft.Dynamics.Ax.Xpp.InfoException: Exception of type 'Microsoft.Dynamics.Ax.Xpp.InfoException' was thrown.
at Microsoft.Dynamics.Ax.MSIL.Interop.throwException(Int32 ExceptionValue)
at Microsoft.Dynamics.Ax.MSIL.cqlClassIL.callReturn(Int32 rc, interpret* ip)
at Microsoft.Dynamics.Ax.MSIL.cqlClassIL.Call(IntPtr c, String methodName, Object[] parameters, Type[] types, Object[] varargs, Type[] varargsTypes)
at Microsoft.Dynamics.Ax.Xpp.XppObjectBase.Call(String methodName, Object[] parameters, Type[] types, Object[] varargs)
at Dynamics.Ax.Application.ReportRun.Run()
at Dynamics.Ax.Application.AlertBatchJobClass.Run() in AlertBatchJobClass.run.xpp:line 76
at Dynamics.Ax.Application.BatchRun.runJobStaticCode(Int64 batchId) in BatchRun.runJobStaticCode.xpp:line 54
at Dynamics.Ax.Application.BatchRun.runJobStatic(Int64 batchId) in BatchRun.runJobStatic.xpp:line 13
at BatchRun::runJobStatic(Object[] )
at Microsoft.Dynamics.Ax.Xpp.ReflectionCallHelper.MakeStaticCall(Type type, String MethodName, Object[] parameters)
at BatchIL.taskThreadEntry(Object threadArg)