Nesting multiple AVERAGEIFS

I have 5 AVERAGEIFS formuals, one for each employee that work fine. I have trouble nesting the 5 employees into one formula. When I add the additional employees to the formula I get a result of #DIV/0!.

The 5 Average
=IFERROR(AVERAGEIFS('Jan2015'!$Z:$Z,'Jan2015'!$T:$T,"Transfer",'Jan2015'!$R:$R,"Employee1"),"")
=IFERROR(AVERAGEIFS('Jan2015'!$Z:$Z,'Jan2015'!$T:$T,"Transfer",'Jan2015'!$R:$R,"Employee2"),"")
=IFERROR(AVERAGEIFS('Jan2015'!$Z:$Z,'Jan2015'!$T:$T,"Transfer",'Jan2015'!$R:$R,"Employee3"),"")
=IFERROR(AVERAGEIFS('Jan2015'!$Z:$Z,'Jan2015'!$T:$T,"Transfer",'Jan2015'!$R:$R,"Employee4"),"")
=IFERROR(AVERAGEIFS('Jan2015'!$Z:$Z,'Jan2015'!$T:$T,"Transfer",'Jan2015'!$R:$R,"Employee5"),"")

Thanks for any help.

If you want the average of all 5, just remove the criteria for the person...

=IFERROR(AVERAGEIFS('Jan2015'!$Z:$Z,'Jan2015'!$T:$T,"Transfer"),"")

There are other employees in my spreadsheet. I want the total average of these 5.

You can do

=SUM(SUMIFS('Jan2015'!$Z:$Z,'Jan2015'!$T:$T,"Transfer",'Jan2015'!$R:$R,{"Employee1","Employee2","Employee3"}))/SUM(COUNTIFS('Jan2015'!$T:$T,"Transfer",'Jan2015'!$R:$R,{"Employee1","Employee2","Employee3"}))

I only did 3 employees, but you should get the idea..
Average is Sum / COUNT
So it's basically SUMIFS/COUNTIFS