[Newbies] How to add a method via a method?

[Dirk Klaschus]

Hello, I want to write a message with a String-argument,
which adds a new method to MyClass:
 ---------------------------------------------------------
aMethod: 'MyClass'
 ---------------------------------------------------------

This is what I wrote for aMethod:
---------------------------------------------------------
aMethod: myClassWhichExist
 "comment stating purpose of message"

 myClassWhichExist compile: 'myMethod
 "comment stating purpose of message"
 | h |
 h:= ''Hello''.
 ^ h.' classified: 'delete'
 ---------------------------------------------------------

I get the following error message:
---------------------------------------------------------
ByteString(Object)>>error:
error: aString
 "Throw a generic Error exception."
 ^ Error new signal: aString
 ---------------------------------------------------------

I understand that the class name 'myClassWichExist' as string-argument
doesn't go along with the compile-message.  But to what do I need to convert
the string-argument to make it work?
Many thanks in advance for your answers.

Olitizia
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