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Glad you got it working.

The expression I was referring to is: guessedLetter + 1
(char)(guessedLetter + 1)

Put the expression in () and cast it to char

Please copy the full text of the error message and paste it here. It has important info about the error.

If you wrote it then you know where the value of the starting and ending characters sent to the generateRange() method are set. Look at that code and think about how you want to change it.
If its...

Do you see where the value of the parameter sent to the generateRange() method is off by one so it includes the letter you don't want included? For example instead of sending 'H' it should send 'I'...

What does that mean? are you asking how to show this String:
I J K L M N O P Q R S T U V W X Y Z
How is the first letter to show chosen? It looks like it is off by one.

Please copy the output and paste it here. Its hard to copy text from an image.