I face a issue when I click notes then the subject appear and when I click subject then white screen appears. What I do
Can u please Share the blocks
Well the problem is with In App Pdf Viewer Extension.
Recast it or update it if available.
No in this the the topic shows by airtable
Try this 
Crackit.aia (4.1 MB)
It was In App Pdf Viewer Extension which was leading to the crash !!
java.lang.NoClassDefFoundError: Failed resolution of: Lyt/DeepHost/InApp_PDFViewer/PDFAdapter;
at java.lang.Class.getDeclaredFields(Native Method)
at gnu.bytecode.ClassType.addFields(ClassType.java:606)
at gnu.bytecode.ClassType.getFields(ClassType.java:506)
at gnu.bytecode.ClassType.hasOuterLink(ClassType.java:260)
at gnu.bytecode.ClassType.getDeclaredMethod(ClassType.java:880)
at gnu.bytecode.ClassType.addMethod(ClassType.java:667)
at gnu.bytecode.ClassType.addMethod(ClassType.java:698)
at gnu.bytecode.ClassType.addMethods(ClassType.java:1009)
at gnu.bytecode.ClassType.getDeclaredMethods(ClassType.java:725)
at gnu.bytecode.ClassType.getMethods(ClassType.java:809)
at gnu.kawa.reflect.ClassMethods.getMethods(ClassMethods.java:106)
at gnu.kawa.reflect.ClassMethods.apply(ClassMethods.java:229)
at gnu.kawa.reflect.Invoke.lookupMethods(Invoke.java:278)
at gnu.kawa.reflect.Invoke.applyN(Invoke.java:185)
at gnu.mapping.ProcedureN.apply2(ProcedureN.java:39)
at io.kodular.Crackit.Pdfnotes.$define(Pdfnotes.yail:10250)
at com.google.appinventor.components.runtime.Form.onCreateFinish2(SourceFile:502)
at com.google.appinventor.components.runtime.Form.onCreateFinish(SourceFile:446)
at com.google.appinventor.components.runtime.Form.onCreate(SourceFile:385)
at android.app.Activity.performCreate(Activity.java:7893)
at android.app.Activity.performCreate(Activity.java:7880)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3286)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3460)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$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: java.lang.ClassNotFoundException: yt.DeepHost.InApp_PDFViewer.PDFAdapter
Mark as Solution 
i was having the same problem then i recast as told by @Anu10 then all fine its working
Recast • Make your old extensions compatible with Kodular Fenix - #17 by Shreyash[quote=“Vishal4, post:1, topic:134773, full:true”]
I face a issue when I click notes then the subject appear and when I click subject then white screen appears. What I do
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In this when I open pdf then it download many times that I opened and saved to storage
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