请教出现这样的DRC错误是怎么回事？

2dmin

LISTING: 1 element(s)
   < DRC ERROR >   
Class:   DRC ERROR CLASS- y" ~5 a* e* r; |: }2 |
Subclass:  TOP9 ^2 B) P# J4 v& Y
Origin xy:   (525.2 1478.0)5 K, i9 i' K' X0 wc
Constraint:  SMD Pin to SMD Pin Spacing+ p7 K+ Q% G7 k
Constraint SetEFAULT
Constraint Type: NET SPACING CONSTRAINTS$ k$ }4 b0 Y* f9 s
Constraint value: 7 MIL
Actual value: 7.7 MIL
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Element type:  SYMBOL PIN
Class:   PIN
PIN:    J1.2
pinuse:   UNSPEC' x. D9 X" S+ r. B6 u
location-xy525.2 1464.3) 3 d$ x/ Z) I3 p( [& I2 p3 x
element is on a dummy net
- - - - - - - - - - - - - - - - - - - -9 k) h% J% C/ d. r) S1 n
Element type:  SYMBOL PIN5 _! y. m8 }5 Z3 p' b$ Q
Class:   PIN
PIN:    J1.11 r; t4 o6 E2 I' n3 U. Y: v
pinuse:   UNSPEC
location-xy525.2 1484.0) 1 k( C( X: I5 b7 M
element is on a dummy net
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请教各位：出现这个DRC是怎么回事？怎么解决？