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如果：
The block diagram 'APFI' uses bus signals. However,
the 'Mux blocks used to create bus signals' diagnostic is not configured
to 'error'. To prevent modeling errors:
(1) Open Upgrade Advisor and run the 'Check for Mux blocks used to create bus signals' check.
(2) Follow the recommendations from this check to make your model compliant.
解决步骤如下：
1，在matlab命令窗口运行：upgradeadvisor('APFI')，（注：印号内容为model的文件名）
2，初始化一会以后会弹出一个界面，把左边的勾选框拖到下面，选中"Check for Mux blocks used to create bus signals"，并且点击右边的“Run This Check”。
3，check完以后，点击最下面的“modify”按钮就行。