Continuous morlet wavelet transform using pywt

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I am using pywavelets to perform CWT on my data, fs = 256Hz, length of the signal is 1024. why does it say invalid wavelet name ?

I tried to perform using haar wavelet, then it worked but I am not sure i have got correct signal.

this is what i tried,

w = pywt.Wavelet('haar')
scaling, wavelet, x = w.wavefun(level=10)

enter image description here

Inputs on solving this is highly appreciated.

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