Concrete5 may present you with the confusing error “Fatal error: Class ‘View’ not found”, which looks like a Loader issue but often it is not. When moving between different servers, the database permissions may not be quite right, which will cause this to happen.
If you check that the user that Concrete5 is using has access to the database and the correct credentials, then often this will solve the issue.
There are various reasons why Loader issues occur, but this is a quite common issue (and the error message isn’t very helpful!)