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.

解決步驟如下：
1，在matlab命令視窗執行：upgradeadvisor('APFI')，（注：印號內容為model的檔名）
2，初始化一會以後會彈出一個介面，把左邊的勾選框拖到下面，選中"Check for Mux blocks used to create bus signals"，並且點選右邊的“Run This Check”。
3，check完以後，點選最下面的“modify”按鈕就行。