The Canvas component crashes my application

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There are some empty fields in Screen 4. Fill those fields.

Refer :point_down:

Logcat
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.forrobnetwork.draw/io.kodular.robin_evian.mydraw.Screen4}: /tmp/1634847574969_0.2923878051335618-0/youngandroidproject/../src/io/kodular/robin_evian/mydraw/Screen4.yail:15:78: unbound location null
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3311)
	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3460)
	at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
	at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2047)
	at android.os.Handler.dispatchMessage(Handler.java:107)
	at android.os.Looper.loop(Looper.java:224)
	at android.app.ActivityThread.main(ActivityThread.java:7590)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
Caused by: /tmp/1634847574969_0.2923878051335618-0/youngandroidproject/../src/io/kodular/robin_evian/mydraw/Screen4.yail:15:78: unbound location null
	at gnu.mapping.Location.get(Location.java:67)
	at io.kodular.robin_evian.mydraw.Screen4.lambda10(Screen4.yail:15)
	at io.kodular.robin_evian.mydraw.Screen4$frame.apply0(Screen4.yail:10)
	at gnu.expr.ModuleMethod.apply0(ModuleMethod.java:186)
	at kawa.lang.Promise.force(Promise.java:27)
	at kawa.lang.Promise.force(Promise.java:37)
	at kawa.lib.misc.force(misc.scm:98)
	at io.kodular.robin_evian.mydraw.Screen4.$define(Screen4.yail:10307)
	at com.google.appinventor.components.runtime.Form.onCreateFinish2(SourceFile:503)
	at com.google.appinventor.components.runtime.Form.onCreateFinish(SourceFile:447)
	at com.google.appinventor.components.runtime.Form.onCreate(SourceFile:386)
	at android.app.Activity.performCreate(Activity.java:7893)
	at android.app.Activity.performCreate(Activity.java:7880)
	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307)
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3286)
	... 11 more
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