请达人帮我看看这个原理图，有不少错误，但不知道是哪

Class Document Source Message time Date No.

[Warning] Sheet.SchDoc Compiler       Floating Net Label D2 13:04:59 2008-10-25 1
[Warning] Sheet.SchDoc Compiler       Signal 15 has no load 13:04:59 2008-10-25 2
[Warning] Sheet.SchDoc Compiler       Signal 12 has no load 13:04:59 2008-10-25 3
[Warning] Sheet.SchDoc Compiler       Signal 11 has no load 13:04:59 2008-10-25 4
[Error] Sheet.SchDoc Compiler            Signal 4 has no driver 13:04:59 2008-10-25 5
[Error] Sheet.SchDoc Compiler            Signal 6 has no driver 13:04:59 2008-10-25 6
[Error] Sheet.SchDoc Compiler            Signal NamedSignal_A0[0] has no driver 13:04:59 2008-10-25 7
[Error] Sheet.SchDoc Compiler            Signal NamedSignal_A1[0] has no driver 13:04:59 2008-10-25 8
[Error] Sheet.SchDoc Compiler            Signal NamedSignal_A2[0] has no driver 13:04:59 2008-10-25 9
[Error] Sheet.SchDoc Compiler            Signal NamedSignal_A3[0] has no driver 13:04:59 2008-10-25 10
[Error] Sheet.SchDoc Compiler            Signal NamedSignal_A4[0] has no driver 13:04:59 2008-10-25 11
[Error] Sheet.SchDoc Compiler            Signal NamedSignal_A5[0] has no driver 13:04:59 2008-10-25 12
[Error] Sheet.SchDoc Compiler            Signal NamedSignal_A6[0] has no driver 13:04:59 2008-10-25 13
[Error] Sheet.SchDoc Compiler            Signal NamedSignal_A7[0] has no driver 13:04:59 2008-10-25 14
[Error] Sheet.SchDoc Compiler            Signal NamedSignal_CLOCK[0] has no driver 13:04:59 2008-10-25 15
[Error] Sheet.SchDoc Compiler            Signal NamedSignal_D5[0] has no driver 13:04:59 2008-10-25 16
[Warning] Sheet.SchDoc Compiler       Net CLOCK has no driving source (Pin U2-2,Pin Vclock-1) 13:04:59 2008-10-25 17
[Warning] Sheet.SchDoc Compiler       Net NetU3_4 has no driving source (Pin U3-4) 13:04:59 2008-10-25 18
[Warning] Sheet.SchDoc Compiler       Net NetU3_6 has no driving source (Pin U3-6) 13:04:59 2008-10-25 19[Warning] Sheet.SchDoc AdvSim         Free Documents simulation setup will not be saved between sessions 13:04:59 2008-10-25 20
[Error] Sheet.SchDoc AdvSim             GND Spice Reference Net (specified in Setup Options) is not in the schematic. 13:04:59 2008-10-25 21