求助，初学者做双脉冲发生器电路仿真出现如下错误

原理图上显示错误的部分如下图，

1.Class Document Source Message Time Date No.
[Error] Sheet1.SchDoc Compiler Signal PinSignal_C?_1[0] has no driver 13:43:52 2013/11/14 9
2.Class Document Source Message Time Date No.
[Error] Sheet1.SchDoc Compiler Signal PinSignal_C?_1[0] has no driver 13:43:52 2013/11/14 10
3.Class Document Source Message Time Date No.
[Error] Sheet1.SchDoc Compiler Signal PinSignal_C?_1[0] has no driver 13:43:52 2013/11/14 11
4.Class Document Source Message Time Date No.
[Error] Sheet1.SchDoc Compiler Signal PinSignal_C?_1[0] has no driver 13:43:52 2013/11/14 12
5.Class Document Source Message Time Date No.
[Error] Sheet1.SchDoc Compiler Signal PinSignal_C?_2[0] has no driver 13:43:52 2013/11/14 13
6.Class Document Source Message Time Date No.
[Error] Sheet1.SchDoc Compiler Signal PinSignal_Q?_2[0] has no driver 13:43:52 2013/11/14 14
7.Class Document Source Message Time Date No.
[Error] Sheet1.SchDoc Compiler Signal PinSignal_Q?_3[0] has no driver 13:43:52 2013/11/14 15
8.Class Document Source Message Time Date No.
[Error] Sheet1.SchDoc Compiler Signal PinSignal_R?_2[0] has no driver 13:43:52 2013/11/14 16