您需要将flask应用传递给Dash实例. 这样.

You need to pass your flask app to your Dash instance. Like this.

app = dash.Dash(__name__, server=server)

因此，请尝试导入服务器，并将其作为参数包含在app1和app2中的Dash实例中. 像这样:

So try importing server and include it as a parameter in your Dash instances in app1 and app2. Like so:

from app import server

app = dash.Dash(name='dash_1', sharing=True, 
url_base_pathname='/dash_1', csrf_protect=False, server=server)

app = dash.Dash(name='dash_2', sharing=True, 
url_base_pathname='/dash_2', csrf_protect=False, server=server)  

希望有帮助.