This error is related to the Oracle Data Provider and appears when you, during project debugging, change the web.config. We will fix this issue in the upcoming v2.5 of Sitefinity
(by the end of this week).
Currently, if you want to prevent getting this error, you should delete Oracle.DataAccess.dll
file from the bin
folder. This file is used with Oracle Database, which Sitefinity
will officially support in v2.5
We are sorry for the inconvenience.