I did see the additional sound file. I assume it should be installed in the aircraft sound file. I'll move it to the CFS2 file and see what happens.
Addendum: I moved it, but the error remains. Here is the Panel CFG:
// This Panel.cfg file created by CfgEdit
// Built Saturday, July 20, 2002 at 22:14 Build:16969
[Window Titles]
Window00=%window_title_00%
Window01=%window_title_01%
Window02=%window_title_02%
Window03=%window_title_03%
[VIEWS]
view_forward_WINDOWS=MAIN_PANEL,THROTTLE_PANEL,COLLECTIVE_PANEL,COMPASS_PANEL
VIEW_FORWARD_ZOOM=0.5
VIEW_FORWARD_EYE=0.0
VIEW_FORWARD_DIR=2.1, 0.0, 0.0
VIEW_REAR_RIGHT_WINDOWS=32
VIEW_REAR_RIGHT_ZOOM=0.5
VIEW_REAR_RIGHT_EYE=0.1
VIEW_REAR_RIGHT_DIR=0.0, 0.0, 150.0
VIEW_REAR_WINDOWS=33
VIEW_REAR_ZOOM=0.5
VIEW_REAR_EYE=-0.2
VIEW_REAR_DIR=0.0, 0.0, 180.0
VIEW_REAR_LEFT_WINDOWS=34
VIEW_REAR_LEFT_ZOOM=0.5
VIEW_REAR_LEFT_EYE=-0.1
VIEW_REAR_LEFT_DIR=0.0, 0.0, 210.0
[Window00]
file=BF109F2_640.bmp
file_1024=BF109F2.bmp
size_mm=640,480
window_size_ratio=1.00
position=4
visible=1
ident=MAIN_PANEL
sizeable=1
render_3d_window=1
window_size= 1.000, 1.000
window_pos= 0.000, 0.000
gauge00=BF109e!Airspeed, 122,414,60,66
gauge01=BF109e!Altimeter, 124,347,60,66
gauge02=BF109e!Boost_Pressure, 321,345,56,55
gauge03=BF109e!Clock, 370,286,42,41
gauge04=BF109e!Heading_Indicator, 191,337,66,76
gauge05=BF109e!Oil_Pressure, 325,412,50,51
gauge06=BF109e!Tachometer, 259,344,62,61
gauge07=bf109e!Attitude, 187,411,70,70
gauge08=fw190a!Vertical_Speed, 259,412,62,61
gauge09=jwb_divebrake!divebrake, 455,368,20,19
gauge10=a6m2_zero!Icon_Map, 377,332,19,18
gauge11=bf109e!Magneto, 89,386,30,90
gauge12=bf109e!Starter, 48,448,30,26
gauge13=bf109e!Flaps, 452,388,32,93
gauge14=MAPE_Prop_Feather!Feather Prop 1, 98, 367 ,20,19
gauge15=rww2-stall-lt, 159,326,20
gauge16=a6m2_zero!Master_Switch, 62,422,15,24
gauge17=HGHB_BRAKE_SOUND, 597,439,40,41
gauge18=f4u1a_corsair!Icon_Engine_Controls, 399,333,18,17
gauge19=concorde!Fuel-Panel-Display-Toggle, 423,333,18,17
gauge20=f4u1a_corsair!Fuel_Selector, 496,432,50
gauge21=JWB.analog_canv, 244,278,12,49
gauge22=JWB.analog_gunv, 260,278,12,49
gauge23=concorde!Compass-Display-Toggle, 127,326,18,17
gauge24=bf109e!Oil_Temperature, 385,356,58,57
gauge25=bf109e!Engine_Temperature, 387,414,54
gauge26=bf109e!Fuel, 545,432,50,50
[Window01]
size_mm=95,132
window_size_ratio=1.00
position=6
visible=0
ident=THROTTLE_PANEL
sizeable=1
window_size= 0.148, 0.276
window_pos= 0.000, 0.726
gauge00=bf109e!thrust_controls, 8,9,72,111
[Window02]
size_mm=280,480
window_size_ratio=1.00
position=7
visible=0
ident=COMPASS_PANEL
window_size= 0.360, 0.800
window_pos= 0.640, 0.200
gauge00=concorde!ADF, 5,378,85,84
gauge01=concorde!Radio-Adf, 91,378,175,86
gauge02=concorde!Radio-Comm1, 89,289,174,82
gauge03=concorde!Radio-Transponder, 88,211,172,70
gauge04=concorde!Radio-Altimeter, 4,287,84,83
gauge05=VW_Autopilot, 12,160,64,119
gauge06=concorde!VOR, 89,118,74,83
gauge07=concorde!Radio-Naviagtion-1, 169,119,87,83
gauge08=b29autopilot, 11,7,253,65
gauge09=mooney_bravo!Fuel Flow, 90,74,94,43
gauge10=mooney_bravo!Clock, 189,76,65,38
gauge11=mooney_bravo!Nav GPS Switch, 14,79,21,37
[Window03]
file=714PopUp.BMP
size_mm=260,70
position=6
visible=0
ident=COLLECTIVE_PANEL
sizeable=1
window_size= 0.303, 0.100
window_pos= 0.340, 0.900
gauge00=jwb_dtank!DumpTank, 4,3,56,62
gauge01=jwb_trim!Trim, 103,4,66,62
gauge02=JWB!cg_pct, 63,35,34,16
gauge03=concorde!Pitch-Trim, 176,2,24,64
gauge04=concorde!Yaw-Trim, 204,44,54,23
gauge05=concorde!Roll-Trim, 213,3,34,36
[Vcockpit01]
Background_color=0,0,0
size_mm=512,512
position=7
visible=1
ident=Vcockpit01
pixel_size=512,512
texture=$main
gauge00=BF109e!Airspeed, 41,329,75,82
gauge01=BF109e!Altimeter, 40,245,76,83
gauge02=BF109e!Boost_Pressure, 303,191,86,85
gauge03=BF109e!Clock, 310,115,49,48
gauge04=BF109e!Heading_Indicator, 119,191,94,108
gauge05=BF109e!Oil_Pressure, 324,324,70
gauge06=BF109e!Tachometer, 212,191,92,91
gauge07=bf109e!Attitude, 129,313,102,101
gauge08=fw190a!Vertical_Speed, 233,324,92,91
gauge09=jwb_divebrake!divebrake, 416,232,27,26
gauge10=a6m2_zero!Icon_Map, 354,166,19,18
gauge11=bf109e!Magneto, 10,279,30,90
gauge12=bf109e!Starter, 4,372,37,31
gauge13=bf109e!Flaps, 467,309,30,93
gauge14=MAPE_Prop_Feather!Feather Prop 1, 71, 222 ,20,19
gauge15=HGHB_BRAKE_SOUND, 234,453,56,57
gauge16=rww2-stall-lt, 156,110,20,19
gauge17=a6m2_zero!Master_Switch, 401,196,25,34
gauge18=JWB.analog_gunv, 215,110,12,49
gauge19=JWB.analog_canv, 200,110,12,49
gauge20=bf109e!Oil_Temperature, 401,267,58,57
gauge21=bf109e!Engine_Temperature, 401,326,57
gauge22=concorde!Fuel-Panel-Display-Toggle, 402,166,20
gauge23=concorde!Compass-Display-Toggle, 91,196,20,20
gauge24=f4u1a_corsair!Icon_Engine_Controls, 377,166,20
[Vcockpit02]
Background_color=0,0,0
size_mm=256,512
position=6
visible=0
ident=Vcockpit02
pixel_size=256,512
texture=$left
gauge00=bf109e!Gear, 68,110,92,182
gauge01=MAPE_cowl_flap!Cowl Flap 1, 12,52,40,150
gauge02=fsd_he111.pitot, 57,52,170,56
gauge03=PARKBREMSE, 12,294,147,137
[Vcockpit03]
Background_color=0,0,0
size_mm=256,512
position=8
visible=0
ident=Vcockpit03
pixel_size=256,512
texture=$right
gauge00=f4u1a_corsair!Fuel_Selector, -2,41,80,160
gauge01=bf109e!Fuel, 76,41,80,160
gauge02=bf109e!Fuel_Warning, 154,41,35,70
gauge03=VW_Autopilot, 75,199,80,160
[Default View]
X=0
Y=0
SIZE_X=8191
SIZE_Y=5165
[Strings]
"window_title_00"=Main Panel
"window_title_01"=Engine Controls
"window_title_02"=ADF Instruments
"window_title_03"=Fuel CG Trims
It's aliased to the George, which is there.