The payer is indicating that one or more of the diagnosis codes you have entered is not valid based on the gender of the patient.
How to Fix
There are two things you will want to check. First, check the gender you have entered for the patient to see if it is correct. Second, if the gender is correct then you will want to change the diagnosis code you have entered.
The diagnosis codes are entered / edited from the add / edit client form, in the section labeled Cases. Open up the edit client form for this page. At the bottom right, click the edit icon associated with the diagnosis code set. Remove the offending diagnosis code. Remember to save the client when done.