IIS error 500.19 cannot add duplicate collection entry of type 'add' with unique key attribute 'name''

sagarnay...

hello sir,

when i hosted my page in a previously maintained project i got error like

http error 500.19 the requested page cannot be accessed because the related configuration data for the page is invalid.

config error:cannot add duplicate collection entry of type 'add' with unique key attribute 'name''

Mudassar

0 1

You have added two AppSettings with same name in the Web.Config and hence you see this error.

I agree, here is the link: https://www.e-iceblue.com/Introduce/spire-office-for-net-free.html