Problem Statement
On attempting to access or performing any operation on a web application that is hosted on IIS, you may get the following error:-
Retrieving the COM class factory for component with CLSID {....
Resolution
While there could be couple of reasons why this can occur, the most likely cause is due to lack of folder permission for the IIS_IUSR group for the folder that has the application code.
The base folder that contains the application code needs to have access for the IIS_IUSR group.
Once the folder is provided access as follows, the issue should be resolved:-
