3815720 - Error: "This report could not be submitted. At least one required field in this report lacks data. A red exception flag marks the expense and a list identifies the field(s) to be filled out. Please provide a value and then submit the report"

I am trying to submit an expense report but am receiving the error below.  Why am I seeing this and how can it be fixed?
 

I am getting the error Error: "This report could not be submitted. At least one required field in this report lacks data. A red exception flag marks the expense and a list identifies the field(s) to be filled out. Please provide a value and then submit the report" while submitting expense report. , KBA , CON-EXP-ADM-FOF , Forms and Fields , CON-EXP-EXP , Expenses , CON-EXP-ADM-EXT , Expense Types , CON-EXP-ADM-LIS , List Management , Problem