该错误一般是在使用Agora SDK时，调用Token Builder的buildToken方法时出现的。可能是由于缺少必要的参数或参数错误导致的。解决方法包括：

• 确保应用程序ID，应用程序证书和频道名等必填参数正确。
• 确保Token Builder方法中的字符串参数正确。

以下是一个简单的示例代码，展示如何正确调用Token Builder方法：

import io.agora.rtc.IRtcEngine;
import io.agora.rtc.RtcEngine;
import io.agora.rtc.RtcEngineConfig;
import io.agora.rtc.video.VideoCanvas;

public class MainActivity extends AppCompatActivity {
    private static final String APP_ID = "YOUR_APP_ID";
    private static final String APP_CERTIFICATE = "YOUR_APP_CERTIFICATE";
    private static final String CHANNEL_NAME = "YOUR_CHANNEL_NAME";
    private static final int UID = 8888;
    private IRtcEngine mRtcEngine;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 创建RtcEngine实例
        try {
            mRtcEngine = RtcEngine.create(getApplicationContext(), APP_ID, new IRtcEngineEventHandler() {});
        } catch (Exception e) {
            e.printStackTrace();
        }

        // 配置RtcEngine
        RtcEngineConfig config = new RtcEngineConfig();
        config.setAppCertificate(APP_CERTIFICATE);
        mRtcEngine.setChannelProfile(Constants.CHANNEL_PROFILE_COMMUNICATION);
        mRtcEngine.enableAudio();
        mRtcEngine.enableVideo();
        mRtcEngine.enableDualStreamMode(true);
        mRtcEngine.setVideoEncoderConfiguration(new VideoEncoderConfiguration(320, 240, VideoEncoderConfiguration.FRAME_RATE.FRAME_RATE_FPS_15, VideoEncoderConfiguration.STANDARD_BITRATE, VideoEncoderConfiguration.ORIENTATION_MODE.ORIENTATION_MODE_FIXED_PORTRAIT));
        mRtcEngine.startPreview();

        // 获取Token
        String token = generateToken(APP_ID, APP_CERTIFICATE, CHANNEL_NAME, UID);

        // 加入频