Expense Export Program - Worflow process is automatically rejected

Hi,

I am trying to run Expense Report Export program it completes normally without any error but when the workflow process kicks off, it is getting rejected automatically without any notification to the user. It says "Expense Report Export rejected some expense reports. Use the link below to view the rejected expense reports." When we are using an employee of Vision instance the program is completing normally. We have defined our own employee and the workflow process is not picking the employee we have created.

Can you please let me know what might be the issue and the probable solution.