I already have "SPListFilter 2.3 Server" solution installed inside our sharepoint server 2013 enterprise. and it is working well. i got this solution from this link http://splistfilter.vitalyzhukov.com/download/. and today i installed the newer version of the solution "SPListFilter 3.03" . but the issue i am facing is that when i tried to add the "SPListFilter 3.03" web part inside my page, i got this error:-
A Web Part or Web Form Control on this Page cannot be displayed or imported. The type could not be found or it is not registered as safe.
So can anyone advice on this error?