Running encodeFrac and display ValueError: Buffer dtype mismatch, expected 'double' but got 'float'

[lilvmy]

When I use the new version of Pyfhel, for example
pip install Pyfhel
def encode_matrix(HE, matrix):
# Base case: if the matrix is one-dimensional, directly apply encodeFrac to each element.
if matrix.ndim == 1:
return np.array([HE.encodeFrac(matrix)])
# Recursive case: apply encode_matrix to each sub-array.
else:
return np.array([encode_matrix(HE, sub_matrix) for sub_matrix in matrix])
HE = Pyfhel()
ckks_params = {
"scheme": "CKKS",
"n": 214,
"scale": 240,
"qi_sizes":[60,40,40,40,60]
}

HE.contextGen(**ckks_params)
HE.keyGen()
HE.rotateKeyGen()
HE.relinKeyGen()
a = np.array([[[1.0,2.4,3.6],[4.2,5.5,6.7]],[[2.3,3.4,4.8],[5.2,6.5,7.8]]])
b = encode_matrix(HE, matrix)
This code runs a error:
return np.array([HE.encodeFrac(matrix)])
File "Pyfhel/Pyfhel.pyx", line 742, in Pyfhel.Pyfhel.Pyfhel.encodeFrac
ValueError: Buffer dtype mismatch, expected 'double' but got 'float'
So how do I solve this problem