error with variables 3.8

[jusrosetyler1123]

i have a program that im working on to emulate a number of clicks over a user defined amount of time with a user defined delay seperation. im working on error checking for the variable type
heres the relevant code

def get_time():
    print("enter 1 for seconds")
    print("enter 2 for minutes")
    print("enter 3 for hours")
    timeTyp = input("please enter one of the coresponding numbers> ")
    timeLen = input("please enter how long you want to run> ")
    timeDel = input("please enter how long you want the delay between clicks in miliseconds or d for default> ")
    try:
        timeTyp = int(timeTyp)
        timeLen = int(timeLen)
        try:
            timeDel = float(timeDel*1000)
        except ValueError:
            if(timeDel.lower().strip(" ") == "d"):
                td = 1.0
            else:
                err = True
        if(timeTyp == 1):
            tl = timeTyp
        elif(timeTyp == 2):
            tl = timeTyp * 60
        elif(timeTyp == 3):
            tl = timeTyp * 3600
        if(err == True):
            raise ValueError
    except ValueError:
        print("invalid input. try again")
        tl, td = get_time()
    return tl, td

what am i doing wrong
i get an error of UnboundLocalError

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also i forgot in global scope

err = False