zone problem in Mapping

i have 12 zones on my map and all zones work perfectly Except zone 12 when i open the door which leads to the zone 12
i got a script run time error and the game lag for a short time and then go back work and the zombie stop spawn

this is the door kvps

trigger

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target - door4
zombie_cost -1000
script_noteworthy -magic_door
targetname - zombie_door
script_flag - enter_zone12

script_brushmodel

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targetname - door4
spawnflags - 1
script_vector - 0 0 100

the volume kvps

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target - zone12_spawners
targetname  - zone12

and this is dlc3_zone_init() in nazi_zombie_mapname.gsc

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dlc3_zone_init()
{
add_adjacent_zone( "start_zone", "zone1", "enter_zone1" );
add_adjacent_zone( "zone2", "zone2", "enter_zone2" );
add_adjacent_zone( "zone2", "zone3", "enter_zone3" );
add_adjacent_zone( "zone3", "zone4", "enter_zone4" );
add_adjacent_zone( "zone4", "zone5", "enter_zone5" );
add_adjacent_zone( "zone6", "zone6", "enter_zone6" );
add_adjacent_zone( "zone6", "zone7", "enter_zone7" );
add_adjacent_zone( "zone8", "zone9", "enter_zone9" );
add_adjacent_zone( "zone9", "zone10", "enter_zone10" );
add_adjacent_zone( "zone10", "zone11", "enter_zone11" );
add_adjacent_zone( "zone11", "zone12", "enter_zone12" );
	/*
	=============
	///ScriptDocBegin
	"Name: add_adjacent_zone( <zone_1>, <zone_2>, <flag>, <one_way> )"
	"Summary: Sets up adjacent zones."
	"MandatoryArg: <zone_1>: Name of first Info_Volume"
	"MandatoryArg: <zone_2>: Name of second Info_Volume"
	"MandatoryArg: <flag>: Flag to be set to initiate zones"
	"OptionalArg: <one_way>: Make <zone_1> adjacent to <zone_2>. Defaults to false."
	"Example: add_adjacent_zone( "receiver_zone",		"outside_east_zone",	"enter_outside_east" );"
	///ScriptDocEnd
	=============
	*/

	// Outside East Door
	//add_adjacent_zone( "receiver_zone",		"outside_east_zone",	"enter_outside_east" );
}

thanks in advance
sorry for my bad english

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zone problem