IIS has problems with some python modules (Plotly)

Question

I have an python flask app which runs perfectly. When i try to run this app in IIS, the app crashes with no log (only generic error 500) at this line: fig = go.Figure()

go come from this import: import plotly.graph_objs as go

Answer 1

I enabled the failed request tracking. Below is a screenshot of the summary.

Summaray

Before the fastcgi error i got this:

GENERAL_READ_ENTITY_END BytesReceived="0", ErrorCode="Ende der Datei (EOF) erreicht.(0x80070026)"