Python Flask IIS FastCGI HTTP Error 500.0 - Internal Server Error An unknown FastCGI error occurred Edit

I was trying to run a Python flask application on IIS. got the error below.

Exception

Python Flask IIS FastCGI HTTP Error 500.0 - Internal Server Error An unknown FastCGI error occurred


Most likely causes:
IIS received the request; however, an internal error occurred during the processing of the request. The root cause of this error depends on which module handles the request and what was happening in the worker process when this error occurred.
IIS was not able to access the web.config file for the Web site or application. This can occur if the NTFS permissions are set incorrectly.
IIS was not able to process configuration for the Web site or application.
The authenticated user does not have permission to use this DLL.
The request is mapped to a managed handler but the .NET Extensibility Feature is not installed.

Things you can try:
Ensure that the NTFS permissions for the web.config file are correct and allow access to the Web server's machine account.
Check the event logs to see if any additional information was logged.
Verify the permissions for the DLL.
Install the .NET Extensibility feature if the request is mapped to a managed handler.
Create a tracing rule to track failed requests for this HTTP status code. For more information about creating a tracing rule for failed requests, click here.

Detailed Error Information:
Module	   FastCgiModule
Notification	   ExecuteRequestHandler
Handler	   FlaskHandler
Error Code	   0x8007010b
Requested URL	   http://localhost:80/
Physical Path	   C:\inetpub\wwwroot\myapp
Logon Method	   Anonymous
Logon User	   Anonymous

More Information:
This error means that there was a problem while processing the request. The request was received by the Web server, but during processing a fatal error occurred, causing the 500 error.
View more information »

Microsoft Knowledge Base Articles:
294807

Solution

OPEN IIS 
Click on Application Pool
Right Click on the Applications Application Pool Name 
Select Advanced Settings 
Identity Change From ApplicationPoolIdentity to Local System 
Click on Ok To Save