opensesame program in android runtime with bug

on my smartphone this program escape automatically. But I don't know where the bug lies.

# Generated by OpenSesame 0.27.3 (Frisky Freud)
# Fri Nov 15 14:32:41 2013 (nt)
# <http://www.cogsci.nl/opensesame>

set foreground "black"
set subject_parity "even"
set font_size "32"
set description "An affordances/ orientation effect type of experiment, modified for the Android runtime"
set font_family "sans"
set title "Orientation effect (Android version)"
set font_bold "no"
set coordinates "relative"
set height "800"
set mouse_backend "droid"
set start "experiment"
set compensation "0"
set width "1280"
set font_italic "no"
set background "white"
set sampler_backend "droid"
set subject_nr "0"
set keyboard_backend "droid"
set canvas_backend "droid"
set transparent_variables "no"
set synth_backend "droid"

define feedback feedback
	set duration "mouseclick"
	set reset_variables "yes"
	set description "Provides feedback to the participant"
	draw textline 0 -128 "End of block" center=1 color=black font_family="mono" font_size=32 font_italic=no font_bold=no show_if="always"
	draw textline 0 -64 "Your average response time was [avg_rt]ms" center=1 color=black font_family="mono" font_size=32 font_italic=no font_bold=no show_if="always"
	draw textline 0 0 "Your accuracy was [acc]%" center=1 color=black font_family="mono" font_size=32 font_italic=no font_bold=no show_if="always"
	draw textline 0 64 "Tap the screen to continue..." center=1 color=black font_family="mono" font_size=32 font_italic=no font_bold=no show_if="always"

define loop block_loop
	set repeat "3"
	set description "A single block of trials"
	set skip "0"
	set offset "no"
	set item "trial_sequence"
	set column_order "correct_response;aim;prime"
	set cycles "6"
	set order "random"
	setcycle 0 correct_response "2"
	setcycle 0 aim "red1"
	setcycle 0 prime "1"
	setcycle 1 correct_response "1"
	setcycle 1 aim "green1"
	setcycle 1 prime "green"
	setcycle 2 correct_response "2"
	setcycle 2 aim "red1"
	setcycle 2 prime "green"
	setcycle 3 correct_response "1"
	setcycle 3 aim "green1"
	setcycle 3 prime "red"
	setcycle 4 correct_response "2"
	setcycle 4 aim "red1"
	setcycle 4 prime "red"
	setcycle 5 correct_response "1"
	setcycle 5 aim "green1"
	setcycle 5 prime "1"
	run trial_sequence

define port_reader port_reader
	set timeout "infinite"

define form_base form_base
	set description "A generic form plug-in"


define form_text_display form_instructions
	set rows "1;4;1"
	set description "A simple text display form"
	set cols "1;1;1"
	__form_text__
	Welcome!
	- the screen will show black word U+201CgreenU+201D or "red", black signal"&&&", or green/red signal"&&&". these words and signals will show a short time, and your task is to instantly judge whether the signal is green or red after the colorful "&&&".
	- If you see a green signal"&&&", tap the left icon.
	- If you see a red signal "&&&", tap the right icon.
	- You will start with a short practice phase.
	- Be as fast and accurate as possible!
	__end__
	set form_title "<b>Instructions<b>"
	set ok_text "Ok,let's begin!"
	widget 0 0 3 1 label text="[form_title]"
	widget 0 1 3 1 label center="no" text="[form_text]"
	widget 1 2 1 1 button text="[ok_text]"


define touch_response touch_response
	set _nrow "1"
	set _ncol "2"
	set description "A grid-based response item, convenient for touch screens"
	set timeout "infinite"

define sequence experiment
	run form_instructions "always"
	run practice_loop "always"
	run form_end_of_practice "always"
	run experimental_loop "always"
	run form_end_experiment "always"

define form_text_display form_end_experiment
	set rows "1;4;1"
	set description "A simple text display form"
	set cols "1;1;1"
	set form_text "The experiment is finished!"
	set form_title "<b>Finished</b>"
	set ok_text "I'm outta here!"
	widget 0 0 3 1 label text="[form_title]"
	widget 0 1 3 1 label center="no" text="[form_text]"
	widget 1 2 1 1 button text="[ok_text]"


define sketchpad white
	set duration "133"
	set description "Displays stimuli"

define loop practice_loop
	set repeat "1"
	set description "A loop containing one or more practice blocks"
	set item "block_sequence"
	set column_order "practice"
	set cycles "1"
	set order "random"
	setcycle 0 practice "yes"
	run block_sequence

define logger logger
	set description "Logs experimental data"

define sketchpad fixation
	set duration "300"
	set description "Displays stimuli"
	set start_response_interval "no"
	draw fixdot 0 0 color=black show_if="always"

define sequence trial_sequence
	set description "A single trial"
	run fixation "always"
	run prime "always"
	run white "always"
	run aim "always"
	run touch_response "always"
	run error_sampler "[correct] = 0"
	run logger "always"

define parallel parallel

define sequence block_sequence
	set description "A sequence containging a single block of trials followed by feedback to the participant"
	run reset_feedback "always"
	run block_loop "always"
	run feedback "always"

define sketchpad prime
	set duration "33"
	set description "Displays stimuli"
	draw image 0 0 "[prime].png" scale=1 center=1 show_if="always"

define form_text_display form_end_of_practice
	set rows "1;4;1"
	set description "A simple text display form"
	set cols "1;1;1"
	set form_text "The practice phase is over. You will now begin the real experiment."
	set form_title "<b>End of practice</b>"
	set ok_text "Ok!"
	widget 0 0 3 1 label text="[form_title]"
	widget 0 1 3 1 label center="no" text="[form_text]"
	widget 1 2 1 1 button text="[ok_text]"


define sketchpad sketchpad
	set duration "0"
	set description "Displays stimuli"
	draw image 0 320 "OK.png" scale=1 center=1 show_if="always"

define sampler error_sampler
	set volume "1"
	set description "Plays a sound file in .wav or .ogg format"
	set sample "notify1.ogg"
	set pitch "1"
	set duration "0"
	set stop_after "0"
	set pan "0"
	set fade_in "0"

define sketchpad aim
	set duration "0"
	set description "Displays stimuli"
	set start_response_interval "no"
	draw image 0 0 "[aim].png" scale=1 center=1 show_if="always"
	draw circle -352 0 192 fill=1 penwidth=1 color=black show_if="always"
	draw circle 384 0 192 fill=1 penwidth=1 color=black show_if="always"
	draw image -352 0 "left.png" scale=1 center=1 show_if="always"
	draw image 384 0 "right.png" scale=1 center=1 show_if="always"

define loop experimental_loop
	set repeat "8"
	set description "Repeatedly runs another item"
	set item "block_sequence"
	set column_order "practice"
	set cycles "1"
	set order "random"
	setcycle 0 practice "no"
	run block_sequence

define feedback reset_feedback
	set duration "0"
	set reset_variables "yes"
	set description "Provides feedback to the participant"

define touch_response __touch_response
	set _nrow "6"
	set _ncol "1"
	set description "A grid-based response item, convenient for touch screens"
	set timeout "infinite"

define joystick joystick
	set allowed_responses "1;2"
	set description "Collects input from a joystick or gamepad"
	set timeout "infinite"
	set _dummy "no"

define touch_response _touch_response