Error message is different from message in test case.

Error message is different from message in test case.(See attached images)
According to the test cases:

• for empty username there should be prompt message "Please enter username";
• for username with size less than 3 caracters there should be prompt message "A username can't have less than 3 characters";
• for username with size more than 20 caracters there should be prompt message "A username can't have greater than 20 characters";
• for empty e-mail there should be prompt message "Please enter email";
• for e-mail with incorrect format there should be prompt message "An email format should be like '@.*'";
• for empty password there should be prompt message "Please enter password";
• for empty confirm password there should be prompt message "Please confirm password";
• for different password and confirmpassword there should be prompt message "Password and confirmation password do not match";
• for user and e-mail that are already registered there should be prompt message "User with the username already exists. User with the email already exists.".