You are trying to merge on datetime64[ns] and float64 columns.

It seems that you are encountering an error while trying to merge columns of different data types. Specifically, you are trying to merge a column of datetime64[ns] type with a column of float64 type. Merging columns is only possible when the columns have the same data type.

To resolve this issue, you can try converting the float64 column to a compatible data type that can be merged with datetime64[ns]. You can use the `astype()` method in Python to change the data type of the float64 column.

Here's an example:

df['float_column'] = df['float_column'].astype('datetime64[ns]')

Make sure to replace `'float_column'` with the actual name of the column you are trying to convert. Once the data types of both columns match, you should be able to merge them without any issues.

If you have any further questions or need additional assistance, feel free to ask!