I have some problem with my mini project. My code is using for calculate r l c or cut off frequency and plot the Magnitude graph of it by showing in user interface. But the graph did not come out and showed this kind of error [enter image description here][[[[enter image description here](https://i.sstatic.net/JTkAUM2C.png)](https://i.sstatic.net/DnAQzi4E.png)](https://i.sstatic.net/Md1mM1pB.png)

Here’s the code for the problem section.

Plot Graph

def graph():
global rc_highpass ,rc_lowpass,rl_highpass,rl_lowpass
resistance = choice2.get()
farad = choice1.get()
for i in range(0,5):
if farad == F_U[i]:
c = c_value/(10**(0+(3i)))
if resistance == Ohms[i]:
r = r_value/(10**(3-(3i)))

f = np.linspace(0,1000000,1000000)

class voutrc:
    def __init__(self,f,r,c):
        self.f=f
        self.r=r
        self.c=c
    def highpass(self):
        omega = 2*np.pi*f
        vout=( 1j*r*omega*c/(1j*r*omega*c+1.))
        return(vout)
def rc_highpass():
    window3 = Tk()
    window3.title("กราฟ")
    window3.geometry("600x400+400+200")
    F_CUT = fcut()
    fc = F_CUT.rc(r,c)
    vout_np = voutrc(f,r,c)
    vout_l = vout_np.highpass()
    dB= 20*np.log10(np.abs(vout_l))
    fig = plt.figure(figsize = (10, 8)) 
    plt.plot(f,dB) 
    plt.plot([fc,fc],[0,-50],"r--",label="Cut off frequency")
    plt.title("Highpass RC")
    plt.xlabel("F [Hz]")
    plt.ylabel("dB")
    plt.xscale("log") 
    plt.grid(True)
    plt.tight_layout()
    # creating the Tkinter canvas 
    # containing the Matplotlib figure 
    canvas = FigureCanvasTkAgg(fig, 
                            window3)   
    canvas.draw() 
    
    # placing the canvas on the Tkinter window 
    canvas.get_tk_widget().pack()
    window3.mainloop()  

I expected that the graph should be like ths[[[enter image description here]