[Python] Incompatible types in assignment while type hinting Python3

For a simple py code when I am using the type it throws me the following error:
error: Incompatible types in assignment (expression has type "object", variable has type "List[str]")

I have tried replacing List[str] with List[AnyStr] but still it doesnt helps.

The following is the skeleton of the func:

import uuid
from typing import List
import numpy as np
def plot_X(
X: List[np.array],
Y: List[str], ### Line throwing error
name: str = str(uuid.uuid4()),
xlabel: str = "Values",
ylabel: str = "Likelihood",
title: str = "Title",
X_to_plot: int = 10,
show=False,
) -> None:

Y = Y if Y else range(len(X))
if len(X) > X_to_plot:
idxs = np.random.randint(0, len(X), X_to_plot, replace=False)
X = X[idxs]
Y = Y[idxs] if Y else range(X_to_plot)

X = X[:X_to_plot]
Y = Y[:X_to_plot]

fig, ax = plt.subplots(figsize=(14, 12))

for i in range(len(X)):
ax.plot(X, linewidth=1.5, label=f"{Y}")

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