what is a/c diagnostic code KLA A1056 mean on a 2000 Mercedes s430?

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I replaced the leaking a/c line, but the air only cools on the right passenger side. Replaced my control unit, it's still doing same thing. It wouldn't even cool at all until I erased diagnostic codes v1256, v1257 and v1269 but it wont let me erase code A1056.