Why do I keep getting a Type Mismatch error on this line? Also, when i click "View" to view my output screen its blank, so nothing is printing.... can so please help me resolve this?

Question

PRINT USING D$; NAM$; VehicleType$; DaysHeld; Miles; Charge

My Code:

'************************************
'* THIS PROGRAM IS TO CALCULATE CAR RENTAL REVENUE GENERATED *
'*************************************
'VARIABLE USED:
'T1$, H1$, H2$, D1$
'NAM$          Customer Name
'VehicleType$  Vehicle Type
'MILAGE        Miles Traveled
'RATE          Vehicle Rate
'DaysHeld      Days Held
'TOTAL         Total Revenue Generated Per Account
'Charge        Charge for the car rental

'*************************************
'* PROGRAM MAINLINE *
'*************************************
CLS
GOSUB InitializeVariables
GOSUB PrintHeadings
GOSUB CalculateTotal
END

'*************************************
'* INITILIZE VARIABLES *
'*************************************

InitializeVariables:
LET T$ = " CAR RENTAL "
LET H$ = " Customer Vehicle Days Miles Total Cost"
LET H$ = " Name Type Held Traveled For Rental"
LET D$ = "/  / ## #### ######"

'*************************************
'* PRINT HEADINGS *
'*************************************
PrintHeadings:
PRINT
PRINT T1$ 'Print Title Line
PRINT
PRINT H1$ 'Print Column Heading, Line 1
PRINT H2$ 'Print Column Heading, Line 2
PRINT
RETURN

' ********************************
' Calculate Total
' ********************************

CalculateTotal:
GOSUB ReadData
DO UNTIL NAM$ = "END"
    IF VehicleType$ = "Compact" THEN
        LET Cost = 10
        LET Rate = .15
    ELSEIF VehicleType$ = "Intermediate" THEN
        LET Cost = 20
        LET Rate = .18
    ELSE
        LET Cost = 30
        LET Rate = .22
    END IF
    LET Charge = Cost * DaysHeld + Rate * Miles
    PRINT USING D$; NAM$; VehicleType$; DaysHeld; Miles; Charge
    GOSUB ReadData
LOOP
RETURN

'*************************************
'* READ DATA *
'*************************************

ReadData:
READ NAM$, VehicleType$, DaysHeld, MilesTraveled
DATA "Jones","Large",6,500
DATA "Smith","Compact",17,3000
DATA "Baker","Intermediate",8,250
DATA "Williams","Intermediate",4,1000
DATA "Winston","Large",3,500
DATA "END"
RETURN

'*************************************
'* END OF PROGRAM *
'*************************************