This error typically indicates a version mismatch between your client and the server you are trying to connect to. The correct build for 3.3.5a is . Check the bottom corner of your game login screen to see your client’s version number. If it displays something different (e.g., 12431 or 13930), you are not using a genuine 3.3.5a client. Obtain a clean client from one of the sources listed above.
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Most 3.3.5a clients are standardized, but you can choose between "Clean/Vanilla" or "HD Modded" versions.
Here are some additional tips and tricks to keep in mind:
