errore SQLite

[kontos02]

Ciao, ho aggiunto altri campi al mio DB ed ora quando inserisco i dati ho questo errore:

07-27 14:25:43.373: E/SQLiteDatabase(1320): Error inserting note_web=44 password_web=33 nome_utente_web=22 nome_web=11
07-27 14:25:43.373: E/SQLiteDatabase(1320): android.database.sqlite.SQLiteConstraintException: prodotti.nome_utente_pc may not be NULL (code 19)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at android.database.sqlite.SQLiteConnection.nativeExecuteForLastInsertedRowId(Native Method)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at android.database.sqlite.SQLiteConnection.executeForLastInsertedRowId(SQLiteConnection.java:775)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at android.database.sqlite.SQLiteSession.executeForLastInsertedRowId(SQLiteSession.java:788)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at android.database.sqlite.SQLiteStatement.executeInsert(SQLiteStatement.java:86)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1469)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1339)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at it.tiwiz.database.Database.inserisciWeb(Database.java:51)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at le.mie.password.InserisciWeb.onClick(InserisciWeb.java:46)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at android.view.View.performClick(View.java:4204)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at android.view.View$PerformClick.run(View.java:17355)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at android.os.Handler.handleCallback(Handler.java:725)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at android.os.Handler.dispatchMessage(Handler.java:92)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at android.os.Looper.loop(Looper.java:137)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at android.app.ActivityThread.main(ActivityThread.java:5041)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at java.lang.reflect.Method.invokeNative(Native Method)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at java.lang.reflect.Method.invoke(Method.java:511)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-27 14:25:43.373: E/SQLiteDatabase(1320): 	at dalvik.system.NativeStart.main(Native Method)