I am using sitefinity9.0.
I am importing the feeds from external site using Alternative Publishing module. When I try to see the feed page I am getting the error message like below and attached the screenshot too.
Unable to cast object of type 'System.String' to type 'System.Collections.Generic.IEnumerable`1[System.String]'.
Please let me know how to solve the issue.
This may be caused by importing a feed with a category element in it. Please see this Knowledge Base article for more information.