IPywidgets create vmin/vmax slider doesn't work

Question

I'm new to Python and I'm struggling with creating interactive Images. I programmed a function that plots an Image from a 3D Matrix. I managed to create a slider to go through slices of the 3D data (first dimension of the matrix).

However, when I try to make a slider for vmin and vmax, I get the error:

ValueError: cannot find widget or abbreviation for argument: 'v1'

My code:

def signalPlot(mat, num):
    sigPlot, ax = plt.subplots()
    sigPlotAx = ax.imshow(mat[num,:,:])
    plt.colorbar(sigPlotAx)
    plt.show()
    return sigPlot, sigPlotAx

def updateSP(num1, v1, v2):
    sigPlotAx.set_data(cleanMat[num1,:,:])
    sigPlotAx.set_clim(vmin=v1, vmax=v2)

sigPlot, sigPlotAx = signalPlot(3DMat,0)
plt.draw()

interact(updateSP, num1=widgets.IntSlider(min=0, max=np.shape(cleanMat)[0]-1, step=1))
interact(updateSP, v1=widgets.IntSlider(min=0, max=0.5, step=.01))
interact(updateSP, v2=widgets.IntSlider(min=0.5, max=2, step=.01))