The error message indicates that the 'numpy.ndarray' object does not have the attribute 'corrwith'. This is because the 'data' variable passed to the 'pearson_fusion' function is a numpy array, but the 'corrwith' method is a pandas method.
To fix this error, you can convert the numpy array to a pandas dataframe before calling the 'corrwith' method. You can use the following code to convert the numpy array to a pandas dataframe:
```python
import pandas as pd
data = pd.DataFrame(data)
```
Then, you can pass the 'data' dataframe to the 'pearson_fusion' function:
```python
composite_index = pearson_fusion(data, weights)
```