This applies to versions 5.7.0 and earlier, and was fixed in version 5.7.1.
HTTP Error 500.24 - Internal Server Error
An ASP.NET setting has been detected that does not apply in Integrated managed pipeline mode.
To use WorkflowGen with an application pool in ‘Integrated’ Managed pipeline mode, you have to remove from the following web.config files the impersonate setting <identity impersonate=“true”>:
all the web.config under the folder/wfgen/wfapps/webservices/