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If you don't even know how to make a string to begin with, you shouldn't even be thinking about making a game. First learn how to program, then write the game, not the other way around.
Ok, long story short, actionscript bytecode has the ability to store a list of constants that they will refer to. This error obviously means that either something is wrong with the definition of the list or how it is used. In either case, it honestly isn't your fault (at least not if you have to ask about this error in the first place).
"The class or interface 'KeyboardEvent' could not be loaded."
That is an actionscript 2 error. Given that his code was actionscript 3.0, it is obvious that you are not using the right actionscript version when compiling.
Kinda, you can include all symbols that you have a statically linkable library or an object file for.
You don't want to include the full dll for the system stuff, you are not allowed, it is not designed to work that way and it's defeating the idea of the dlls being replaceable.
I don't think that you are considering the height of the handle itself in the calculations. The limitation box is restricting the registration point, not the full object. (But that's just my guts speaking, not something I looked up)
For the volume issue, you are not doing the right math. You should take some classes in linear functions and figure out what the issue is.
You are doing post collision checking instead of pre, this leads to this kinds of issues. Check for collisions before moving to the new spot, not after. This means that you don't need to remove yourself from being inside stuff, you are never in it to begin with.
Write a properly formated 2000+ word description of the game, then we can talk. If you can't be arsed to do this, the project will most likely fail big.
I am surprised that you didn't get any errors about missing the separators. They are mandatory when using the perl compatible regex library. With that out of the way, let's worry about the real issue.
Your regex will match any string that has at least one lowercase character. That is usually not good enough.