[Playerstage-users] symbol lookup error: undefined symbol:

[Rebble <hyy...@16...>]

Hello all:
   i run a program to test the use of power proxy. when i open the server
side ,type: player tpower.cfg,i get :
 Stage driver creating 1 device
   6665.42.0 is "table"
  Stage driver creating 3 devices
   6665.4.0 is "r0"
   6665.5.0 is "r0.ranger:0"
   6665.6.0 is "r0.laser:0"
  Stage driver creating 1 device
 6665.2.0 is player: symbol lookup error:
/home/hyy/moveturn/./libstageplugin.so: undefined symbol:
 _ZN14InterfacePowerC1E14player_devaddrP9StgDriverP10ConfigFilei
This is my .cfg and .world file:
driver
 (
  name "stage"
  provides ["simulation:0"]
  plugin "libstageplugin"
  worldfile "tpower.world"
 )
 driver( name "stage" provides ["map:0" ] model "table" )
 # robot 0
driver(
  name "stage"
  provides [ "position2d:0" "sonar:0" "laser:0" ]
  model "r0"
 )
 driver
( name "stage"
  provides [ "power:0"] 
)

driver
(
  name "nd"
  provides ["position2d:1"]
  requires ["output::6665:position2d:0" "input::6665:position2d:0" "laser:0"
"sonar:0"]
  max_speed [2.0 30.0]
  min_speed [0.5 15.0]
  wait_on_stall 1
)
.world file
 resolution     0.02
 interval_sim 100
 include "pioneer.inc"
 include "map.inc"
 include "sick.inc"

 size [40 20 ]
 gui_disable 0
 gui_interval 100
 gui_menu_interval 20

 window(
  size [ 250.000 300.000 ]
  center [2 3]
  scale 0.02
 )
 map(
  bitmap "bitmaps/table.png"
  map_resolution 0.02
  size [30 18]
  name "table"
 )
 define p2dx pioneer2dx
 (
  laser()
  blobfinder()
 fiducialfinder(range_max 8 range_max_id 5 )
 )
 p2dx
 (
  name "r0"
  pose [4.0 3.0 0]
  color "blue"
 )
could anyone give me some hint?? Thanx !
                       Re.

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