This is when I select the month from the combo box. I get that error
Between DateSerial(Year([forms]![mainmenu]![cboYear]),Month([forms]![mainmenu]![cboMonth]),1) And DateSerial(Year([forms]![mainmenu]![cboYear]),Month([forms]![mainmenu]![cboMonth])+1,0)
Between DateSerial([forms]![mainmenu]![cboYear],[forms]![mainmenu]![cboMonth],1) And DateSerial([forms]![mainmenu]![cboYear],[forms]![mainmenu]![cboMonth] +1,0)