Output with different id showing Can't Have Multiple Outputs

I created two buttons and two graphs with a different ID. But when I created a callback function as below.

import dash
import dash_core_components as dcc
import dash_html_components as html
import plotly.graph_objs as go

app = dash.Dash()
app.layout = html.Div([
    html.Button('Prev', **id='button-pgw1'**,n_clicks=0),
    html.Button('Prev', **id='button-pgw2'**,n_clicks=0),

    dash.dependencies.Output(**'scatter1**', 'figure'),
    [dash.dependencies.Input('button-pgw1', 'n_clicks')])
def update_output(n_clicks):
    data = " button-pgw1 clicked"
    return data

    dash.dependencies.Output('**scatter2'**, 'figure'),
    [dash.dependencies.Input('button-pgw2', 'n_clicks')])
def update_output(n_clicks):
    data = " button-pgw2 clicked"
    return data

Here both the callback has a different id but when I am running this it’s showing error as below.
**CantHaveMultipleOutputs: **
You have already assigned a callback to the output
with ID “scatter1” and property “figure”. An output can only have
a single callback function. Try combining your inputs and
callback functions together into one function.

@dipak96 Tried this against dash==0.39.0 and removed all ** and I’m not experiencing errors.

What version of Dash are you running?

I updated Dash version and it’s running fine now. @Marc-Andre Thanks for you help.