关于电气 规则

我是个PCB排版的新手        想请教下用ORCAD画原理图检查电气规则时出现这样的错误是什么原因 怎么修改? 
Checking Electrical Rules
ERROR [DRC0004]   Possible pin type conflict R307,B Output Connected to Output:  SCHEMATIC1, PAGE5 FLASH MEMORY  (313.44, 206.25)
ERROR [DRC0004]   Possible pin type conflict U2,GND Output Connected to Power:  SCHEMATIC1, PAGE5 FLASH MEMORY  (313.18, 198.63)
ERROR [DRC0004]   Possible pin type conflict Y1,GND2 Power Connected to Output:  SCHEMATIC1, PAGE8 RF Radio  (145.54, 106.68)
ERROR [DRC0004]   Possible pin type conflict Y1,GND1 Power Connected to Output:  SCHEMATIC1, PAGE8 RF Radio  (145.54, 111.76)
ERROR [DRC0004]   Possible pin type conflict U2,VCC Output Connected to Power:  SCHEMATIC1, PAGE5 FLASH MEMORY  (313.18, 201.17)
ERROR [DRC0004]   Possible pin type conflict C601,A Output Connected to Output:  SCHEMATIC1, PAGE5 FLASH MEMORY  (321.06, 175.77)
ERROR [DRC0004]   Possible pin type conflict C601,A Output Connected to Power:  SCHEMATIC1, PAGE5 FLASH MEMORY  (321.06, 175.77)
ERROR [DRC0004]   Possible pin type conflict R308,B Output Connected to Output:  SCHEMATIC1, PAGE5 FLASH MEMORY  (275.84, 175.51)
ERROR [DRC0004]   Possible pin type conflict R308,B Output Connected to Power:  SCHEMATIC1, PAGE5 FLASH MEMORY  (275.84, 175.51)

Checking for Unconnected Nets
WARNING [DRC0007]   Net has no driving source N19061281:  SCHEMATIC1, PAGE7 ETHERNET PORTS  (642.62, 159.51)
WARNING [DRC0007]   Net has no driving source UNNAMED_3_M25P80_I946_HOLDL:  SCHEMATIC1, PAGE5 FLASH MEMORY  (280.16, 201.17)
WARNING [DRC0006]   Net has fewer than two connections N19061281:  SCHEMATIC1, PAGE7 ETHERNET PORTS  (642.62, 159.51)

没有人会能指教下吗?