Failed to open stream:Permission denied in FileCache.inc.php on line 90

So, that’s another issue. Before moving forward, don’t forget to set more strict permissions for folder that don’t require public access. 777 for entire ojs root folder most often isn’t safe.

This looks like page controller can’t handle operation for some reason. There are several similar topics on the forum, do you already tried solutions described there? e.g.: An unexpected error occurred. You may have been logged out. Please reload the page and try again