Write a program that count how many prime numbers between the minimum and maximum values provided by user. If minimum value is greater than or equal to maximum value, the program should throw a Invalid Range exception and handle it to display a message to the user on the following format: Invalid range: minimum is greater than or equal to maximum. 

For example, if the user provided 10 as maximum and 20 as minimum, the message should be: Invalid range: 20 is greater than or equal to 10.