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Your example looks like how to convert a String to an enum. Not how to convert an enum to a String.

If you must use an enum, then change day to be a Week object:

Week day = ??? // no idea how to covert a String to a Week object
Then switch(day) will work if you Remove the Week. from the case...

The case statements expect a String constant. Change the values used in the case statements to be Strings.
For example create a class named Week. Add final static String variables using the names...

There is some missing details in your post:
What source line did the error happen on?
What is "We" in the message: We cannot be converted to String

The case statements expect a String constant. ...

Please copy the full text of the error message and paste it here. The message should show the source line where the error happens.

Note: An enum is not a String. The case statement wants String...