ValueError: non-hexadecimal number found in fromhex() arg at position 0

[ClimenteA]

In [5]: encrypted_data = aes.enc(data_string="your-data")
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
Cell In[5], line 1
----> 1 encrypted_data = aes.enc(data_string="your-data")

File ~/Documents/social-media-posts-scheduler/.venv/lib/python3.12/site-packages/AES_Python/main.py:176, in AES.enc(self, data_string, file_path, running_mode, key, iv)
    174 if data_string:
    175     if running_mode == "ECB":
--> 176         return self.__ecb_enc(data_string=data_string, keys=self.key_expand(key))
    177     elif running_mode == "CBC":
    178         return self.__cbc_enc(data_string=data_string, keys=self.key_expand(key), iv=iv)

File ~/Documents/social-media-posts-scheduler/.venv/lib/python3.12/site-packages/AES_Python/main.py:543, in AES.key_expand(cls, key)
    536 """
    537 Expands the given key to 11, 13 or 15 round key depending on key length.
    538 :param key: Key that is expanded.
    539 :return: Tuple containing round key matrices.
    540 """
    542 # Format key correctly for the key expansion
--> 543 key_array: NDArray[np.uint8] = np.frombuffer(bytes.fromhex(key), dtype=np.uint8)
    545 # Key expansion setup:
    546 # Determines the number of rounds and the number of words using the key length.
    547 if len(key_array) == 16:

ValueError: non-hexadecimal number found in fromhex() arg at position 0