Hello I just got the same error message "Unable to find file Graphics/Titles/okladka1".

I went into the Graphics folder, Titles and the name of the image was written like this "ok³adka1", I removed the "3" and add "l" and then it let me open the game.

Not sure why that happened, but after I read someone else had the same problem I thought maybe this could help anyone else with the same issue.

Just a note for the dev: for some reason there's a superscript 3 where the l in the Title image name is supposed to be; since the graphic folder wasn't encripted I just went in and changed it myself, but that's one of the first times I've run into something like that from an RPG Maker project.

 i get an error saying "RGSS-RTP Standart not found"