Setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (6000,)

Question

I'm trying to give fch1 to pywt.cwt for creating coefficients but when I give that this comes with a value error as a question

samplingFreq = 100
dataPeriod = 60  # sec
numSamples = samplingFreq * dataPeriod * 3
print(numSamples)
readDataFromFile = open('input.ecg', 'rb')
datatype = np.dtype('B')
filedata = np.fromfile(readDataFromFile, datatype)
# print(filedata)
p = list(filedata)
ecgarr = np.array(p)
totSamples = len(ecgarr)
numRows = int(totSamples / numSamples)
curateData = [[0] * numSamples for i in range(numRows)]
totEntries = int(numSamples / 3)
fch1 = [[0] * 1 for i in range(totEntries)]

# Divide the total samples in sets of 'numSamples'
xcntr = 0
for x in range(0, totSamples, numSamples):
    ycntr = 0
    for y in range(x, (x + numSamples), 1):
        curateData[xcntr][ycntr] = ecgarr[y]
        ycntr = ycntr + 1

    xcntr = xcntr + 1

## Convert curateData into a channels

cntr = 0
for x in range(0, numRows, 1):
    cntr = 0
    for y in range(1, int(numSamples / 3), 1):
        #print(y)
        fch1[cntr] = curateData[x][3 * (y - 1)]
        # Do CWT
        coef, freq = pywt.cwt(fch1, np.arange(1, 129), 'morl')
        print(coef)

I'm not able to find out why I'm getting the error.

coef, freq = pywt.cwt(fch1, np.arange(1, 129), 'morl')

On the above line of code, I'm getting error. Any Help would be so appreciable. Thank you