AttributeError: 'DataFrame' object has no attribute 'param'

Following the example application on this URL Structure with a DataStore — Panel v1.4.2 (holoviz.org)

I am getting the following error in my DataStore class. Can someone help me how to get rid of this error?
AttributeError: ‘DataFrame’ object has no attribute ‘param’

I am new to param/panel, can someone please help.

I have updated my panel and param library but now I am getting the following error:

str returned non-string (type rx)

Can you provide some code?

It’s likely you’re calling pd.DataFrame with param instead of param.DataFrame or pn.pane.DataFrame.