請問一下

我是4S 前天JB 然後今天我在使用CYDIA他突然出現 然後重開機後 CYDIA那些就消失了 然後出現下面這個英文

we apologize for the inconvenience but SpringBoard has just crashed
MobileSubstrate/did not/cause this problem:it has protected you from it
Your device is now running in Safe Mode.All extensions that support this safety system are disabled

請問我要怎麼解決?? 刪除最後安裝的那個程式也沒用耶!!
請知道的大大幫我一下 謝謝