小白求救！protel99se问题，出现了这个问题应该怎么解决

错误警告，应该都是红色圈叉的问题，求大神赐教
Error Report For : DocumentsSheet1.Sch    29-Dec-2015  13:20:53

#1 Warning   Unconnected Input Pin On Net NetU2_1
   Sheet1.Sch(U2-1 @820,330)

#3 Error   Floating Input Pins On Net NetU2_1
Pin Sheet1.Sch(U2-1 @820,330)

#4 Warning   Unconnected Input Pin On Net NetU2_2
   Sheet1.Sch(U2-2 @820,350)

#6 Error   Floating Input Pins On Net NetU2_2
Pin Sheet1.Sch(U2-2 @820,350)

#7 Warning   Unconnected Input Pin On Net NetU2_3
   Sheet1.Sch(U2-3 @820,370)

#9 Error   Floating Input Pins On Net NetU2_3
Pin Sheet1.Sch(U2-3 @820,370)

#10 Warning   Unconnected Input Pin On Net NetU2_4
   Sheet1.Sch(U2-4 @820,390)

#12 Error   Floating Input Pins On Net NetU2_4
Pin Sheet1.Sch(U2-4 @820,390)

#13 Warning   Unconnected Input Pin On Net NetU2_5
   Sheet1.Sch(U2-5 @820,410)

#15 Error   Floating Input Pins On Net NetU2_5
Pin Sheet1.Sch(U2-5 @820,410)

#16 Warning   Unconnected Input Pin On Net NetU2_27
   Sheet1.Sch(U2-27 @820,290)

#18 Error   Floating Input Pins On Net NetU2_27
Pin Sheet1.Sch(U2-27 @820,290)

#19 Warning   Unconnected Input Pin On Net NetU2_28
   Sheet1.Sch(U2-28 @820,310)

#21 Error   Floating Input Pins On Net NetU2_28
Pin Sheet1.Sch(U2-28 @820,310)

#22 Warning  IO Pins And Output Pins On Net S1
   IO Pins                  : Sheet1.Sch(U1-2 @180,480)
   Output Pins              : Sheet1.Sch(U2-7 @640,360)


End Report