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 Floa ting 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